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Old 11-10-2014, 08:41 PM   #1
tyler37075
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Default 2015 wrx spt vs stock cat back

Does anyone have any dyno results with the stock wrx cat back vs spt cat back on a 2015 wrx. I'm getting ready to order a new 2015 and was wondering if the spt exhaust was worth the money.
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Old 11-10-2014, 09:43 PM   #2
peterex
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Like most catbacks, it is probably more about the sound than a significant performance gain. Especially with everything else being stock.

I have it on my '15 and I like the sound. Not obnoxious at all, though cold startup is loud (but that is an issue even on the stock exhaust). If you can get it for invoice, it is not a bad deal. It appears to be higher quality than the SPT catback on my '10. Maybe that is why they now call it the STi performance catback, LOL.
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Old 11-11-2014, 01:06 AM   #3
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I just have the stock catback and it is freaking loud on cold start up and idles high but then tones down and you can barely hear it. That's actually how i can tell if its somewhat warmed up when inside(when i can't here it anymore) IMO i would not spend the money and just buy an aftermarket one. Although the SPT catback is nice and worth the money considering its not $1000+ like all the other catbacks available.
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Old 11-11-2014, 02:03 AM   #4
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Unless you're absolutely positive that you're not going to do any modifications for power, I don't recommend the SPT catback. I believe the piping 2.5", which is not optimum for a power gains. I recommend sticking with 3" exhausts.
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Old 11-11-2014, 10:43 AM   #5
Dislimn
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Pretty sure last gen WRXs were fine up to Stage 2 with a cat delete (down pipe? j-pipe? whatever-pipe) and the stock catback.

At any rate, I like my STI exhaust.
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Old 11-11-2014, 04:09 PM   #6
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Also have the STI exhaust on my '15 and love the sound. Does not drone at all. Unless you plan on making over 350-400 whp, 2.5 inch midpipe is more than enough. It is also a great quality exhaust. I would highly recommend it.
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Old 11-11-2014, 05:23 PM   #7
tyler37075
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Quote:
Originally Posted by nmasse View Post
Also have the STI exhaust on my '15 and love the sound. Does not drone at all. Unless you plan on making over 350-400 whp, 2.5 inch midpipe is more than enough. It is also a great quality exhaust. I would highly recommend it.
Is it actually bigger piping than the factory exhaust or do they just use mandrel bends and different mufflers?
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Old 11-11-2014, 06:24 PM   #8
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Before buying my 2015 WRX, I test drove one with the SPT exhaust (didn't end up buying it because there was a ridiculously high mark-up on it). I will admit it sounded great straight from the factory, but I couldn't feel any power difference between that car and the stock exhaust. If you're looking for the exhaust purely for sound, save your money and buy a Nameless axle-back with the muffler delete. It's considerably cheaper and sounds much better than the SPT exhaust. If you're actually looking for power, consider an aftermarket performance cat-back like Nameless, Invidia, Perrin, Cobb, etc.
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Old 11-11-2014, 08:30 PM   #9
tyler37075
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Quote:
Originally Posted by Restomage View Post
Before buying my 2015 WRX, I test drove one with the SPT exhaust (didn't end up buying it because there was a ridiculously high mark-up on it). I will admit it sounded great straight from the factory, but I couldn't feel any power difference between that car and the stock exhaust. If you're looking for the exhaust purely for sound, save your money and buy a Nameless axle-back with the muffler delete. It's considerably cheaper and sounds much better than the SPT exhaust. If you're actually looking for power, consider an aftermarket performance cat-back like Nameless, Invidia, Perrin, Cobb, etc.
I think we may be looking for 2 different things. I like quiet power. I'm just looking for a little edge on my wife's 2015 wrx. It's stock with a n accessport and an etune from brentuning. I thought I would try the spt exhaust, a cai and get brentuning to tune this one also. He did an awesome job on the first one!!!
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Old 11-11-2014, 08:36 PM   #10
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Quote:
Originally Posted by tyler37075 View Post
I think we may be looking for 2 different things. I like quiet power. I'm just looking for a little edge on my wife's 2015 wrx. It's stock with a n accessport and an etune from brentuning. I thought I would try the spt exhaust, a cai and get brentuning to tune this one also. He did an awesome job on the first one!!!
Coming to Wisconsin anytime soon? You can have mine. lol.
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Old 11-11-2014, 10:35 PM   #11
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Got an SPT laying around? I may be interested. PM me if your serious and willing to ship..


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Old 11-13-2014, 09:06 AM   #12
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It is a larger bore pipe as well. At least 2.5 or maybe even 2.75. Once again, you don't need massive exhausts to make power with the stock turbo.


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Old 11-13-2014, 12:22 PM   #13
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"Worth it" is a bad question. Is it worth it to me if I buy a 2015 to spend the 1K+ price tag on a fancy branded exhaust that sounds slightly different? No. To you? Maybe.

02-14 WRX/STI's had no problem breathing through the stock exhaust.
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Old 11-15-2014, 11:42 PM   #14
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I have the SPT on my '15 and noticed that the muffler hangs noticeably lower than a stock WRX or STI. Not happy about that but it sure sounds good!
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Old 11-17-2014, 12:09 AM   #15
203Rex
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You're better off getting an aftermarket exhaust for your car. Nameless muffler delete is a good choice especially if you're not in the market to do a full catback right away.
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Old 11-18-2014, 06:22 PM   #16
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I have it, love the look on the car and the sound. Yes, you can get other options for less, but this is a great combination of sound and noise. Quiet in traffic, loud when you're on it, I'm not a boy racer anymore, and for me it is the perfect mix.
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Old 11-18-2014, 09:51 PM   #17
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It's near $1000 for slightly better exhaust note. Piping is still 2.5" so you're not really widening the exhaust flow, which doesn't even matter since your still using stock down pipes which are also 2.5". Better to start with a tune, downpipe and then get into exhaust options. Even then, a catback exhaust really won't do much - In my own opinion that $1000 could easily go to other areas of the car and provide a bigger benefit

But hell, if you want the noise, who am I to say no!
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Old 11-19-2014, 12:33 PM   #18
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Quote:
Originally Posted by nmasse View Post
Also have the STI exhaust on my '15 and love the sound. Does not drone at all. Unless you plan on making over 350-400 whp, 2.5 inch midpipe is more than enough. It is also a great quality exhaust. I would highly recommend it.
It doesn't drone at 1500rpm?

My standard WRX exhaust does and it's quite annoying
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Old 11-19-2014, 06:59 PM   #19
peterex
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Quote:
Originally Posted by acemastr View Post
It doesn't drone at 1500rpm?

My standard WRX exhaust does and it's quite annoying
There's some drone on a cold startup, but that is about it. With a 6MT, you are not spending much time at 1500 rpm, anyway.
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Old 11-23-2014, 02:06 PM   #20
Blue Monday
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I have the STI cat back on my 15' WRX, as others have said, it has just the right amount of noise, not too loud so as to be obnoxious, but enough that you can hear some nice noise when you flooring it.
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Old 01-18-2015, 05:10 PM   #21
greatwhiterex
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Hers some factual info for you 15 owners, and others saying to stay with the factory catback because of minimal power gains on prior gens by getting a 3" catback.

Just got off the dyno friday night w my "stage 2" wrx.
My mods are:
Mishimoto intake w box
killer b catless J pipe
FACTORY mid pipe***
FACTORY intermediate pipe****
nameless axleback muffler delete

The factory pipes are ALL 2 3/8" diameter
SPT is 2.5" diameter.

My car made only 270whp/298wtq
with the factory intermediate and midpipe.

Now my two friends results and mods:
Jareds 15 wrx same dyno:
Ets intake w box
ets catless j pipe
invidia q300 FULL 3" CATBACK
312whp/328wtq!!!!
THATS ALL FROM THE RESTRICTIVE FACTORY 2 3/8" PIPING ON MY CAR!
he made 42whp/30wtq more than me.

Amrits 15 wrx same dyno
Mishimoto intake w box
mishimoto catted 3" j pipe
invidia q300
298whp/325wtq

Again huge gains because of the FULL 3" exhaust. Only variables here really are the 3" full exhausts VS factory 2 3/8" piping on my car.

Needless to say i ordered a catless intermediate pipe and Invidia Q300 catback and will now make basically what theyre making when i go back

Same cars
same tuner
same dyno.
Different results.
Thank the factory 2 3/8" piping once again. So GET A 3" CATBACK if youre going stage 2 to get the most power out of your 15 wrx. Prior year and model info (factory catback) does not really apply here as you can see.
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Old 01-18-2015, 07:56 PM   #22
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.....

Last edited by justint5387; 12-29-2016 at 02:31 PM.
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Old 01-18-2015, 08:03 PM   #23
simpleJ
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looks like aside from the hard parts and maf scaling probably not given that it is the same tuner
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Old 01-18-2015, 08:39 PM   #24
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Greatwhite ! Hi

BTW i made 327wtq lol.. going back for my retune as well.. i should be at 312whp and 328wtq lol .. I been askingg dave when i can come back in .. cause when he tuned my car he couldn't change few things .. which he was later on when Jared went for the second time ..
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Old 01-19-2015, 12:01 AM   #25
greatwhiterex
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We are all targeting 19 psi. Same tuner same cars, essentially the same parts.
Whats up Jatt!
As soon as my parts arrive im going back in. Sorry about the torque being off by 2wtq, too many numbers to remember haha.
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