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Thouuuught I had replied to this but maybe not. (I did)

JW thanks for the tip. I did talk to them, they didn't anticipate being able to ship for several weeks. I'm talking to another American company and a British one to see what kind of prices and lead times I'm looking at. I've waited this long so I don't care if it's here within a week, but I also don't want to wait 3 more months especially now that I've swapped the ELH and downpipe and expect to dislike the resulting interaction with my SPT.

PURE thanks as well. I was looking through their other offerings and I was indeed intrigued by the Super Turbo. It sounded nice in the video and I do like the overall look minus the tips (can't get past the giant dual exit). I don't know if having each runner pass through both silencers actually does anything, but it's cool if it does and I do like the look. Unfortunately, I can't wait for them to decide about building one with quad exit. For the price of the Milltek I guess I could potentially get the HKS and have a shop weld on different tips, I just hate the idea of hacking up a brand new $1000 modification. I toyed with the idea of buying a welder and learning as I go while adding a resonator to my SPT but the last thing I need is more "occasional use" equipment. And if I'm putting forth any effort on this whole shebang I do want to go ahead and have a 3" exhaust for the future.

I did cancel my order with RSD and won't buy from them again due to the combination of this situation along with other issues I've had. I realize they are huge and won't know the difference and that's fine, but I will feel better giving my money to a company that deserves it.
 

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The HKS Legamax Premium and HKS Super Turbo Muffler are the quietest catback exhausts for the 2011+ STI. I've heard everything out there including Corsa, Cobb, ARK, Milltek, Grimmspeed, Maddad and the Q300 to name a few and they are all louder. The HKS systems have a Helmholtz Resonator in the middle for frequency tuning which is the main reason. The Super Turbo Muffler is actually quieter than the Legamax Premium because of the exhaust tips which kinda sucks because they look better. HKS muffler angle and tip arrangement is also perfect! Many other cbe systems have the mufflers & tips sitting in such a way they look as if they are pointing down.
The stock catback is fairly quite when attached to a properly fitted downpipe with HFC like Cobb. The HKS is louder than the stock exhaust when attached to the same downpipe and in all fairness it should be, but barely.
HKS is also releasing an anniversary edition full Titanium Super Turbo Muffler for anyone who wants to spend around $4k. Looks hot though!



yup confirm on that i am running a lachute exhaust on my 2015 STI and i still have the HKS legal max sitting in the back yard and when it was on the car it was actually too quite, i can hear my bpv every shift lol only thing i didnt like were the huge exhaust tips.
 

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Today I used an Apple app to measure the noise inside de car. I know is not the most scientific study but is the noise level that I heard inside de car. The phone placed in the central cupholders next to hand brake
. Here are the details:

STI MY17 with KB ELH, HKS Funnel, Cobb downpipe, STP Exhaust.
Radio off, Aircon off
Tires 265 Bridgestone RE-01


Normal driving was btw 3k and 4k @50 mph. I did some pulls to 6k and when reducing gears was using heal and toe. Top speed during the pulls was 70 mph.

I lost the file, but remember that the highest noise level, using Z frecuency, was 93db. At ilde was 85db.

At the end I got a nice offer to buy the Q300 single Exhaust. One I installed will repeat the test

J

Finally I installed the exhaust and swapped the Cobb downpipe for a coated Grimmspeed DP at the same time. It is the last time I decided to do all together on jack stands alone, I am to old for this :(

I have drove the car only 20 miles, I do not want to get into boost zone because I do not have tuned the car.

First impresions: so far, below 4K, the sound is different but not louder, using the same app to measure the STP, I got 88 db. THe Q300 single is much lighter than SPT. The 4in tailpipe fits nicely in the exhaust hole

Once I got the tune an more miles with report results
 

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Cool! Would you mind recording sound clips with your single exit Q300 Set up? I may go the same route and purchase a single exit Q300 come this Christmas :)

Finally I installed the exhaust and swapped the Cobb downpipe for a coated Grimmspeed DP at the same time. It is the last time I decided to do all together on jack stands alone, I am to old for this :(

I have drove the car only 20 miles, I do not want to get into boost zone because I do not have tuned the car.

First impresions: so far, below 4K, the sound is different but not louder, using the same app to measure the STP, I got 88 db. THe Q300 single is much lighter than SPT. The 4in tailpipe fits nicely in the exhaust hole

Once I got the tune an more miles with report results
 

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Cool! Would you mind recording sound clips with your single exit Q300 Set up? I may go the same route and purchase a single exit Q300 come this Christmas :)

Once the exhaust is settle down will try to record a sound clip. I know there is one in youtube. it is a silver sti from Florida
 

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do any of the older single exit exhaust work/fit (like from the older GR)?

I have come to the conclusion after having a few different exhausts, single always sounds nicer (cleaner tone), especially on ELH.

Something about the dual (y pipe) really messes with the sound.
 

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do any of the older single exit exhaust work/fit (like from the older GR)?



I have come to the conclusion after having a few different exhausts, single always sounds nicer (cleaner tone), especially on ELH.



Something about the dual (y pipe) really messes with the sound.

I have the Cobb for my GD and VA. And I have to say it's super quiet with single exit on my GD. The quad tips on my VA even though it's quiet creates enough deep rumble to give me a headache on long trips. Both cars stage 3+


Sent from my iPhone using Tapatalk Pro
 

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what I am asking is can one buy a GD exhaust and put it on a VA.

The Cobb from the GD sounds better than dual setup found on the VA, and I was a big fan.

I personally hated the Cobb exhaust on my VA. Way too deep and intruded horribly in the cabin. The Corsa was soooooo much better, even though it was much louder. The amount of complaints from family and friends with my Cobb setup didn't help either.

My favorite exhaust (only made for GD), and really nothing comes close (corsa is the closest) is the Apexi WS2. I really want to put that on my car, which is why I am asking.

I assume the fitment would be all kinds of messed up, but maybe an exhaust shop could get it to work?
 

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what I am asking is can one buy a GD exhaust and put it on a VA.

The Cobb from the GD sounds better than dual setup found on the VA, and I was a big fan.

I personally hated the Cobb exhaust on my VA. Way too deep and intruded horribly in the cabin. The Corsa was soooooo much better, even though it was much louder. The amount of complaints from family and friends with my Cobb setup didn't help either.

My favorite exhaust (only made for GD), and really nothing comes close (corsa is the closest) is the Apexi WS2. I really want to put that on my car, which is why I am asking.

I assume the fitment would be all kinds of messed up, but maybe an exhaust shop could get it to work?
The GD stuff will not fit the GV/VA platforms without someone fabricating it to fit. The main reason the GD stuff sounds better is because the acoustics aren't split in two at the axle like the late model cars. A single exit exhaust will always sound better on a EJ than a dual especially when acoustics for daily driving are important. I had several systems on my 06 STI from Fujitsubo, Cobb, and eventually the HKS STM which was my favorite. All these, without question sounded better than my 15 STI does with the HKS Legamax Premium.
The main issue you'll find trying to purchase an single exit for the late model cars is all the systems are made for "racing" which makes them loud/er than preferred. No company I'm aware of makes a touring style muffler single exit exhaust for the GV/VA chassis so anything like you are describing must be custom made.
Also consider the car itself has different acoustics so making an exhaust to mimic the same thing on a GD may not yield the exact results you expect.

Not sure if mentioned in previous posts, but any EJ equipped Subaru with the addition of an EL header will sound quieter due to the pulse frequency being evenly spaced. Maybe this would help if you haven't done it yet.

I wish Fujitsubo didn't step down the primary pipe size to 70mm when they use to make the GD stuff 76mm! If they made their new systems with a 76mm primary they would easily be at the same level as HKS or quieter depending on cbe model compared. They have a quad carbon tipped system system that would look awesome! Akropovic Also would be nice but they said they aren't interested in making exhausts for Japanese cars unless it's the R35 GTR...sad:(. The EvoX system they sell the least numbers of and is what made them decide the Subaru market wasn't worth investing in...Im sure they're right.
 

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well, what I did is bought the Corsa, loved the tone of it, and then I sealed the joint with a solid metal plate (welded in there). It's probably not ideal for flow, but i doubt it's truly hurting.

Subaru-weld-off-muffler — imgbb.com

The only problem is I have noticed is that I ever so slightly hear a metal sound (almost rattle sound) on the runoff (letting off the gas) at some rpms 2-3-- think reflecting off the wall in parking garages. But the tradeoff is so worth it! It's been great and even quieter but still retains that Corsa signature sound, but the Invida looks to be the best fit and is super quiet, although not as cool sounding, but arguably the quietest for our cars.
 

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Nice, I didn't know that existed. Too bad it's Invidia cause the Q300 has been proven to not be the quietest exhaust for a touring style system even on the GD. For the less than $600 might be worth a shot to install it, season the muffler for 1000miles or so, and see if you like it. If not then assuming you have a hfc I commission someone to add a resonated Helmholtz resonator to it. There should be plenty of room under the car!
 

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^^there actually is not much room to add another resonator. I tried, and I kept on bottoming out on it.

What on a GD do you think is the quietest? I have had 6 different ones, and by far the Apexi WS2 was my favorite. Maybe I should just buy the muffler and have a shop fab me a catback?

Seriously, the tone is freaking amazing, but so quiet at all the right frequencies when you were not on it.

I mean, come on, I know it is subjective, but I personally think this is perfect! Wish I could get this sound on my 15+

Apexi Noir 2005 Saab 9-2x Aero - YouTube

and on ELH, it's 10x better than any other setup I have heard. Especially at the low speeds-- it has this neat gargle/growl that almost sounds exotic.

WRX Leaving - YouTube
Bugeye Video Clip - YouTube
 

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^^there actually is not much room to add another resonator. I tried, and I kept on bottoming out on it.

What on a GD do you think is the quietest? I have had 6 different ones, and by far the Apexi WS2 was my favorite. Maybe I should just buy the muffler and have a shop fab me a catback?

Seriously, the tone is freaking amazing, but so quiet at all the right frequencies when you were not on it.

I mean, come on, I know it is subjective, but I personally think this is perfect! Wish I could get this sound on my 15+

Apexi Noir 2005 Saab 9-2x Aero - YouTube

and on ELH, it's 10x better than any other setup I have heard. Especially at the low speeds-- it has this neat gargle/growl that almost sounds exotic.

WRX Leaving - YouTube
Bugeye Video Clip - YouTube
It's tuff to say on the GD. Aren't too many cars on the market that have as many CBE choices as the GD cars do/did.

I guess the question that comes to my mind is when you say "quietest", are you willing to sacrifice power to keep it quiet? I ask because there are systems that are quiet but the mufflers are either restricted or chambered which will limit flow sacrificing power to achieve lower db levels. I personally don't like this option unless there is no other choice.
The Fujitsubo Legalis R exhaust I had on my GD at one time was chambered, but it was super quiet and by far the quietest exhaust I've ever heard on a GD. I lost 20whp on my setup at the time which was around 430whp with a Cobb CBE that was straight through 3" after the entry flange was modified to 3". The Fujitsubo exhaust was so quiet I couldn't hear the car idle in my house. I kept it for the street and ran the Cobb on the track along with the fact the exhaust was actually several lbs lighter than the Cobb. The stainless was thinner and the flanges were stamped instead of 1/2" thick so what it took away in power I felt was justified for the weight savings, noise reduction and looks. Looked so much better and cleaner than the Cobb!
Fujitsubo Legalis R Cat Back Exhaust - Subaru WRX STI 2004 | 790-63031

This was all before I got the HKS Super Turbo Muffler which was the best GD exhaust I had and have heard. I modified the entry flange again and the muffer is straight through 75mm instead of restricting down like so many Japanese systems do. Loved IT!!!

I've never seen an Apexi WS2 on a GD. Would be curious to see it's anatomy and find if it restricts down anywhere or if the muffler is chambered.
 

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I am not willing to sacrafice much power so a stright through design muffler is defintely a must. I am okay with it not 3" on the end.

Here is what I had--https://apexi-usa.com/noir-muffler-2002-2007-subaru-impreza-wrx-sti

I have heard the Legalis and it is super quiet, but has no balls, if you know wha I mean.The Apexi has a tone that is quite amazing, and a lot nicer than the COBB, IMO.

I would probably agree the HKS is one of the best ones. Not as good as the Apexi, but certinly uinque and pleasent, even with ELH.
 

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I am not willing to sacrafice much power so a stright through design muffler is defintely a must. I am okay with it not 3" on the end.

Here is what I had--https://apexi-usa.com/noir-muffler-2002-2007-subaru-impreza-wrx-sti

I have heard the Legalis and it is super quiet, but has no balls, if you know wha I mean.The Apexi has a tone that is quite amazing, and a lot nicer than the COBB, IMO.

I would probably agree the HKS is one of the best ones. Not as good as the Apexi, but certinly uinque and pleasent, even with ELH.
Makes me interested to hear one then. My reservation with the Apexi NOIR is for the money the piping is just steel coated. Regular steel will break down quickly under high heat especially when used on track.
I agree with you on the sound of the Legais R, but for me the unintended benefit was hearing more of my turbo which was nice for a change.
I did however love the sound of the HKS STM. It has a very clean, dry not too deep sound that was nice to listen to on track and for me would be hard to beat with another mass produced system.
 

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^^there actually is not much room to add another resonator. I tried, and I kept on bottoming out on it.

What on a GD do you think is the quietest?
I can say with near certainty that the AVO 3" catback in the quietest on the market. I have this exhaust on my car and it is very quiet. It can get a little boomy inside the car once in a while, but a lot of other mods have pushed up the NVH. It's still fine for me and I don't have much tolerance for loud exhausts.

AVO EXHAUST 3INCH STAINLESS STEEL CAT BACK EXHAUST - 04-07 STI AVO Turboworld S2102G3HA001J
 
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