I have the SPT on a 15+ STI with Killer bee header, stock intake with HKS Funnel, Cobb catted DP and I do not have drone, the sound is deeper.So I had the SPT and the drone became outright ridiculous when I added my Spoolinator kit which was catless at the time. I can’t imagine any amount of resonators solving that. The Corsa was way better than that.
No, the issue never was resolved. The vendor who I bought it from was helpful in managing the attempt and got a middle man to provide a replacement piece at cost. I do like the exhaust otherwise. Was a bad weld on one of the tips.
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why not just get the Cobb catback?? I love my Cobb turbo back on my 17sti.. sounds deep and doesn't droneI have the SPT on a 15+ STI with Killer bee header, stock intake with HKS Funnel, Cobb catted DP and I do not have drone, the sound is deeper.
I amconsidering the SINGLE Q300, weight savings and some hp, but I could not find anyone with one installed. According to Invidia the noise level is 93 db. Any feedbacl would be nice.
BTW everytime I start the STI the alarm of my neighbour's M4 triggers
why not just get the Cobb catback?? I love my Cobb turbo back on my 17sti.. sounds deep and doesn't drone
another reason i like the quad setup is it looks completely stock, so no trouble with polizia + the cobb quadtip isn't as obnoxiously loud as some of the single exits (tomei, invidia)I do not kown where I read it, here o NASIOC, that aftermarket exhaust does not add hp and some of them are heavier than stock. That is the reason why I am more inclined to the Single q300 is lighter and with less bends in the exhaust system. I like the single exit as you can see on my avatar my S2000 has only one exit and was able to pass the smog and the inspection in Spain
I notice that Cobb is the most popular but I do not know if it is beacuse is the best or because the OTS maps.
I just bought a 2019 STI today and am considering Subaru Performace Exhaust or an Invidia Q330!Any comments/
If you order that from the parts catalogue, it will not fit. Subaru changed the midpipe with the RA and into the 2019, hence why you can’t order it from the factory.Please explain the mid-pipe.I can stiil order the performance exhaust fron their parts cataloque,but not from the factory!Is it worth it?
The midpipe is 75mm for the 15+, it's the 11-14 that is 65mm. Don't want anyone to get the wrong idea. The 15+ HKS Legamax and STM also fits the 11-14 so the one HKS shows for the 11-14 which is 65mmm isn't needed.Very interesting. It doesn't look like they sell the full catback for the 5 door unfortunately (I know this is a 2015+ thread). Of note, it looks like their midpipe is 65mm which is important to those who feel they need a 3" exhaust setup.
I've been waiting 3 months on my Milltek at this point. RallySport Direct (rather unapologetically) doesn't seem to be able to get their distributor to get in contact with them. Along with the price and the crapshoot of build quality, I'm debating cancelling that order. Maybe I could just have a shop fab me a new 3" mid pipe with a good enough resonator and keep the SPT axleback (along with ELH and catted downpipe)...
Keep the info coming, guys. 95% of aftermarket exhausts are out for me because of noise levels, and many of them wouldn't work anyway because of how they interact with ELH.
I agree. Even though the catback is worth some power (not much) on stock turbo it's hardly worth it for the money spent so the stock catback is usually worth keeping till it's the last thing remaining. I always prefer a HFC as I've gotten older otherwise the fumes make me nauseous. A good quality HFC will not restrict any power or spool on the turbo so the only thing it hurts is your wallet.I loved the combo of the catless downpipe and a stock catback. I ran it for almost 3 years. It was the perfect sound increase from stock. Catted would have been the same without the smells or the overboosting in cold temps. Highly recommend it, there's really nothing wrong with the stock catbacks. They perform very well until you get into replacing headers or the turbo.
Oops. Sorry about that. Thanks for clarifying that. I would just stay in the GR section where I belong :lol: except everything except the 15+ forums is pretty much dead.The midpipe is 75mm for the 15+, it's the 11-14 that is 65mm. Don't want anyone to get the wrong idea. The 15+ HKS Legamax and STM also fits the 11-14 so the one HKS shows for the 11-14 which is 65mmm isn't needed.
Legamax Premium 31021-BF001 used for 11-19 STI Sedan using 75mm primary/midpipe.
Super Turbo Muffler 31029-AF013 used for 11-19 STI sedan using 75mm primary/midpipe.
Sent from my PH-1 using TapatalkThe Subaru Performance Exhaust isn't an option for the 2019 with the mid-pipe change. Can't speak to the Q330, just the Cobb which I'm old and like cause there's no drone and it's the quietest.
HKS makes a Super Turbo Muffler for the hatch but its expensive and has one large tip per side. It looks good from the back but kinda weird from the rear 3/4 angle. I can say it does sound good and it doesn't have a Helmholtz resonator in it. HKS said they were considering making a quad tip version with smaller tips...it would look better IMO.I've been doing some reading on Helmholtz resonators vs 1/4 wave. Both are after the same goal, but Helmholtz resonators are based on the velocity of exhaust gases and work on the same principle that causes a sound when the wind or your breath crosses the opening of a beer bottle. 1/4 wave resonators (not sure if there is a more specific name for them - it's basically a closed J pipe) focus more on countering the specific sound waves.
If I had a welder (and the ability to use it proficiently), I would give that a shot. You can try to identify the resonant frequency first, then you basically build the pipe a quarter the length of the wavelength of that frequency if I understand correctly (which in most cases seems to be fairly long, ~ 3 feet). A lot of people actually have one pipe welded on, and then instead of it just being a pipe with a cap on the end, they cap it off with a slightly larger pipe and create a slip fitting so they can effectively modify the length of the J pipe within a specified range. Obviously you'd shoot for the length you calculated, but it sounds like tweaking things even a cm or two can make a difference on effectiveness.
Since DIY welding is out of the question and HKS doesn't have an exhaust with Helmholtz resonator for the GR, I don't think adding resonators will yield great bang-for-the-buck, so I'll likely keep after the Milltek.
With that said, thanks again for the info, this has been an educational moment even if I don't put it into use on my car.