I also wanted my car to have stock like sound, its my daily and my s2000 has a 70mm single and i need a break from that sometimes. I have the grimmspeed catted dp and hks legamax premium cat back. I would say it isn't any lounder than stock, you just hear more of the rumble. With the stock exhaust, i had some drone in the cabin during a cold start. That has been eliminated now. Eventually I will add an ELH, and from what I have read it should make it slightly quieter in the cabin.

 

You're not going to leave a lot of power on the table by keeping the stock catback. I use an SPT single catback with 450whp. People put melon-launchers on their cars because they like them or have a hard-on for Fast and Furious. That kind of flow really isn't needed until you're making a hell of a lot more power.

 

I have a catted DP. At one point a Perrin midpipe, now a Nameless Performance midpipe, both resonated. Finishing it off are stock mufflers.

It is slightly louder than stock. The 2 midpipes' sound and power are practically identical.

I also have NP 5" mufflers, but are a bit too loud so the stockers are staying. Stocker drone.

 

keep stock exhaust until you are going to get a turbo upgrade

 

Invidia catless dp + q300 catback.. Close to stock. Too quiet


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You're kidding, right? I had the same setup and that's total bullshit lol. Sound is subjective, yes, but this is false

 

Thanks guys. Here is some more info that may be relevant.

I'm going to run a Cobb ots stage 2 map for a while. I'm not sure that will be a good idea with the stock cat back. Will it work OK?

Then, I will be doing some fueling mods and a pro tune later on, possibly as soon as this summer. Will the stock cat back flow enough to get the most out of those?

If I will need to install one anyway I'd like to do it at the same time I do the DP. And, a little louder would be fine. I just don't want something obnoxious.

 

Sorry wrong term, not close to stock, it's close to q300 catback only without the dp. But still, it's really quiet for me. I was thinking before to change to a different brand of catback only


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Q300 is one I'm thinking about. Anyone in the Chicago are have one I can hear in person?

 

Trone- The Q300 ain't quiet!!!

There is no aftermarket exhaust that is truly quiet. It doesn't exist.


Keep the stock exhaust, but maybe replace the midpipe.

 

My Milltech turbo back is quieter than stock but the price and build quality sucks ass.

 

no it's not. I almost bought a Milltek, and the only thing that is quieter is idle.

As soon as you get above 1500rpm, it's louder.

 

I guess maybe I should have said quieter than SPT stock exhaust. I have never heard a non-SPT stock one before but my Milltek with my other mods is definitely quieter than my SPT exhaust that originally came with the car. Plus, I have the EC Approved catted version of the Milltek which is the quieter version.

 

COBB is pretty quiet. It's more a purr. I'm running catless and a turbo upgrade. No drone and no neighbor complaints

 

Sorry, but BS. I absolutely hated the Cobb. Better than SPT, but wow, the low frequency tone this exhaust makes with a downpipe was awful. Cobb refunded me full amount, so I will saya amazing customer service.

It sounded like I had installed the subwoofer on, and let it only play 40-60 hertz.

And then when you got on it, it was quiet. Backwards of a good exhaust. It was well built though.

You should have seen the reaction of the tech when I upgraded to the Corsa.

 

I really liked my COBB TB pre KB ELH. It had the perfect sound for me but once I switched out the header, it started droning for me and eventually pushed me over to finding something as quiet as possible without going back to stock. I'm actually pretty happy with the sound from my Milltek.

 

That's weird. From what I've heard the Cobb is one of the few exhausts that's supposed to play well with the ELH, like your Milltek.

 

Some examples of how my Milltek TB sounds.


Cold Start outside at 1700 rpm idle

Cold Start in car at 1700 rpm idle

1700 rpm idle at 30 ft away

Backing out

Drive by

Driving around (accelerating from 15-50 mph at 3:39 mark. Pretty quiet compared to my old Cobb)

More driving around (sorry, lots of traffic so couldn't really do pulls)

 

Some examples of how my Milltek TB sounds.


Cold Start outside at 1700 rpm idle

movie


Cold Start in car at 1700 rpm idle

movie


1700 rpm idle at 30 ft away

movie

Backing out

movie

Drive by

movie

Driving around (accelerating from 15-50 mph at 3:39 mark. Pretty quiet compared to my old Cobb)

movie

More driving around (sorry, lots of traffic so couldn't really do pulls)

movie

DAMN! I wish someone did this for the cobb catback

 

OP, just keep the stock catback and go with an aftermarket catted DP. It is still going to be louder than stock with this setup but there is no exhaust out there that I know of that is as quiet as the stock exhaust.

I'm personally running the Invidia Q300 (still have the stock downpipe) because in my research it was the most quiet aftermarket exhaust I could find. I was just tired of looking at how ugly the stock mufflers/exhaust was and the Q300 hasn't disappointed in any way. It looks great, is relatively quiet, and a great value IMO (I was about to get mine for $723 shipped on Amazon). I'm sure when I go with an Invidia catted downpipe it will be even louder but right now it isn't obnoxious, doesn't drone, and I can easily carry on a conversation in my car (the car itself is still louder than the actual exhaust).

 

it is not quiet when trying to be quiet. lol. It's absolutely horrible driving around, especially on the highway. All you heard was a low frequency bass note.

It was flat out embarrassing to have anyone in the car. I had never been bothered by such an annoying exhaust.

 

Sorry I wan't clear.

What do you think of the Corsa? I am looking at it and my complaint about the STI/P performance exhaust is the same as yours about the Cobb.

 

Thanks all for your opinions. I'm thinking a catted dp with the stock cat back is the way to go after all.

 

Here is a video of my car I made last year. I had posted it somewhere in the forum, but can't find it.

Stock muffler
Stock Muffler - YouTube

Nameless 5" muffler
5 in NP Muffler - YouTube

Description of the other components are in the video.

 

Update.. I installed the downpipe with the stock cat back. It is noticeably louder but not obnoxious. So far I'm happy with it.

 

Now if you put equal length headers on, it will be as quiet as stock again, if not quieter.

 

No! I had ELH on my stock catback with Invidia catted downpipe, and it added quite a bit of sound, especially from 2-3k.

 

Check out mine with the new Grimmspeed resonated exhaust with a catted Grimmspeed downpipe. This is exactly the sound I was going for. It's not loud at all.

https://youtu.be/7lRaNh6MFa0

 

Haha there seem to be such mixed opinions. The absolutes make sense (Q300 is quiet / No it's not!!), but the ones with relativity are hard to grasp (you would think everyone would agree that a certain exhaust is either louder or quieter than stock etc.)

Any advice from this crowd for people with the SPT? I like the SPT overall. I would be bugged a lot more by the supposed drone if the car itself wasn't loud as hell at highway speeds anyway. Wind noise is moderate, but tire noise is horrible on anything but brand new tires. But ultimately down the road I'm looking at a downpipe (catted Invidia or Cobb most likely) as well as ELH. Honestly I already paid so much for the SPT (yes I wanted it, but it wouldn't have mattered b.c it came on the car) I wouldn't mind spending $1000+ on something besides another catback. I don't want something loud, I just want a nice sound (as others mentioned, the SPT really only bugs me that it's so loud on cold idle and when trying to creep quietly through the neighborhood).

 

I had the SPT and absolutely hated the droning. So I replaced it with the Nameless mufflerless catback, which sounds epic and somehow got rid of the drone, but there's plenty of volume. If I had to do it again, I would've gone with the 5-inch mufflers to quiet the volume down. Seriously, the Nameless made me regret going through 2 Subarus with the SPT.

 

for max quiet with a downpipe: ELH, and stock catback. The headers mellow the exhaust because of the equal pulses, and the stock catback does a decent job of decreasing sound. At least on my GR hatch it did.

 

GR hatch is a different exhaust (catback and muffler setup) so really hard to compare.

I actually believe the big muffler on the hatches do a lot better job than the dual mufflers.

 

I have the Fujisubo Legalis R catback with cobb catted downpipe on my 09 sti hatch, it is very close to stock. I wonder how this exhaust is on the 2015+ STI

 

Maddad Whisper or HKS Legamax

 

TheLegend,

I am interested in the Madad Whisper but their website
says "Note: We have not tested on a 2015 model yet but anticipate a few minor changes are needed. We will announce official 2015 fitment soon.".


I emailed them a few weeks ago but got no reply.


Do you have information that it fits the 15+ STI?

Dave

 

TheLegend,

I am interested in the Madad Whisper but their website
says "Note: We have not tested on a 2015 model yet but anticipate a few minor changes are needed. We will announce official 2015 fitment soon.".




I emailed them a few weeks ago but got no reply.


Do you have information that it fits the 15+ STI?

Dave

Don't wait on maddad that posting for 2015 testing has been up for ages, I prev had maddad and it was perfect for me and OP I'm actually tempted to buy the Gd axleback from maddad and have a custom setup welded up.