The ETS Cat-back exhaust for the 2015-2018 WRX is a made right here in our facility. This exhaust features a true 3.0 all the way through mid-pipe that connects to the rear section splitting into two 3" pipes and finished off with quad 3.5" tips. V-band connections are utilized on all connections (except the factory 2 bolt) for a leak proof seal (no gaskets to blow out or replace!).
- True 3.0" All The Way From Mating Flange To Muffler Tips
- V-Band Connections For a Leak Proof Seal
- Quad 3.5" Double Wall SS Tips
- 41lbs = Midpipe(10lbs), Y-Pipe(7lbs), Rear Section(24lbs)
- Adapter included to fit stock down pipe
- Hardware included for aftermarket down pipe
*** Please note the blue tips will fade over time. This is common on all blue tipped exhaust systems.
Car has come alive. I was weary on if I should get the extreme or muffled version but opted for extreme. Cold starts are loud but once the car idles, it becomes very reasonable. Basically in the sweet spot and balance between loud but no abrasive. Virtual no cabin drone (not abalrasive, can hold a conversation and can hear music even with the terrible subaru sound system lol). Brings out the rumble in an un-obnoxious way while idling but once you get on it, the car reacts and becomes a demon. 10/10 recommended. It has that “adult” loudness and factor to it. Doesn’t sound like a fart can and I have been getting a TON of compliments on the sound from non-car friends which confirmed that this exhaust is legit. Fitment was scary good, especially with v-bands. If you’re on the fence, get the extreme.
ETS Subaru WRX/STI 2015+ Catback Exhaust System
Sounds amazing! Easy install and keeps sounding better with time for break-in. Now I just need a downpipe🤔
This catback has awakened my car! It has been paired with a catless DP so my car sounds completely different than the previous cat that was on it. Cold starts sound ridiculous enough that your neighbors will may start to hate you. Overall really happy with this exhaust and wouldn’t change a thing…
Amazing just amazing 👏
Came with everything needed and checklist from start to ship. The fit is perfect and the sound is amazing. High quality system. Ets kills it with the extreme system.
QUESTIONS & ANSWERSAsk a Question
I have done a bit of research, i have a Invidia Catted Downpipe w/ 2 Bungs Manual. If i have looked at everything correctly this will work with the down pipe on 17 wex
Yes, you should be able to bolt up your downpipe to our catback as we have designed our exhaust system to be a direect factory replacement.
Will this fit a 21 STI? Want to make sure before I order.
Yes, the 2021 has not changed and these parts will bolt up no problem.
What do i do with the graphite gasket?
The order of gasket should go Downpipe -> Graphite Gasket -> Metal Adapter -> Vibrant Gasket -> Midpipe
Do I need an adapter to fit to the stock downpipe of my 2018 wrx?
Nope! We provide everything needed for install.
Will this fit a 2020 STI?
Yes the catback will.
So On my stock downpipe 16 wrx sti, which order do I put the gaskets?
Here is how the gaskets should stack up with the factory downpipe and an ETS catback.
Stock Downpipe -> Factory Gasket -> Adapter Flange -> Vibrant 3" Gasket - > ETS Catback
so with the stock downpipe on my 17 wrx, do i remove the donut gasket and use the three gaskets from the kit you sent, or do i keep the donut gasket on and use the gaskets you sent?
You will want to remove the donut gasket and use the gasket kit we sent. It should go Factory Downpipe -> Small Hole Gasket -> Adapter Plate -> Vibrant Large Hole Gasket -> ETS Catback
can it fit a cvt?
The catback does fit the CVT models. Its the downpipe that does not.
Is this stainless steel?
Yes it is. We use 304SS.
What's the weight of the cat back kit with the resonator? Thanks.
The weight of this exhaust system boxed and shipped is 56lbs.
Do I need anything else like flanges or gaskets bolts anything at all. Does the kit comes with everything?
This will include everything needed for install. That includes the adapter to work with stock exhaust. The only thing reused from the old exhaust is the stock gasket if you are running a stock downpipe.
Is it recommended to buy a new donut gasket for this install?
No, you throw the stock donut gasket away.
Is everything included in the kit to connect to a stock down pipe or do I need any additional adapters or gaskets?
Everything needed for stock downpipe and aftermarket downpipe is now included.
Does this fit on 2019 wrx?
The catback does fit all 15+ WRXs.
I have your ets extreme with res on my 16 sti and was looking to get the next one down? Just the tips tho? With mufflers. Was wonder what my options are
If you want to add mufflers to your current catback this is what you will need
Hey, do you guys offer sponsorships or military discounts?
Here is a link to our military discount - https://www.extremeturbosystems.com/pages/ets-military-discount
Does the ETS mid/y-pipe connect directly to the factory down pipe or do I need adapters?
Yes, we designed our catback to be a factory replacement. You will need 3" gasket.
What is the size of the exhaust tip? 3 or 3.5?
3.5" Quad tips!
Will I get a HP gain? If so, how much?
You will see a power gain when matched with a quality tune. How much is really dependent on the tune.
With this mate with the Cobb downpipe?
Yes it will
Will this ETS CATBACK work with the INVIDIA CATLESS DOWNPIPE?
Yes, it will
I was wondering if the ETS SUBARU WRX/STI 2015+ CATBACK EXHAUST SYSTEM fit a 2019
The catbacks do fit the 19+
Will this fit the 2020 STI as well?
We haven't had confirmed fitment on the 2020 yet but it should as I don't think they made any significan't changes to the bumper or chassis.
Is there anyways to just purchase the axle back muffler portion? I have an ets y and mid pipe and looking to get the mufflers
Yes we list the rear section of the catback in the exhaust section of our website.
one of my clamps fell off of my WRX 2018, is there a way I could get a replacement?
Yes, we have the T-Bolt clamps available separate on our website.
Is this legal for street use? What’s the current decimal levels?
This is for offroad use. There are a lot of variants that dictate volume
Which combination do you recommend to avoid drone? Car is a 2019 STI and sees a lot of road trips.
Resonators and mufflers are a must then!
Will the full exhaust system fit the 2019 Subaru wrx sti , and if so will it need a tune ?
The catback will bolt straight up. No tune needed if the cat remains in place.
Do you guys offer military discount? If so how do i go about getting it on my order
I'm considering both your j-pipe and catback exhaust for my 2017 WRX. Have you considered offering both as a turbo back system with the 2-bolt flange replaced with a v-band? With all the other connections being v-bands, it would be great to eliminate that last bolted/gasketed connection.
We use the 2-bolt to make sure our Jpipe can pair with a stock catback, and our catback can pair with a stock Jpipe. If you purchase both of those parts it would be considered a "turbo back system.
Do i need a separate adapter to bolt this cat back on to my stock Sti downpipe?
https://www.extremeturbosystems.com/collections/15-19-sti-exhaust-systems/products/grimmspeed-subaru-downpipe-to-3in-catback-adapter This is what you are looking for.
Do the tips only come double wall? Really wanna run a full ETS J-Pipe to Catback/Turboback, but don’t like double walled tips.
We only do the double wall on the Subaru exhausts.
Compatible with 2019 sti ?
Yes, the catback is.
Will this exhaust require a tune? Can I run it with no issues after install?
No tune required if the factory catalytic converter remains in place. To really benefit from it, we do suggest getting the tune.
is the exhaust full titanium and how much will the hp increase?
The exhaust is Stainless Steel.
I have a ETS full cat-back on my 2017 wrx with mufflers and I am looking to see if I can buy just the axel-back portion to get rid of the mufflers. Is that something I can do or do I have to buy the full new cat-back?
Sounds great but will this increase my hp? I currently have stock exhaust.
Absolutely, anytime you can free up exhaust flow in a turbo car you are going to have better spool and be able to make power easier.
What is the difference in the ETS Catback Extreme with resonator and without? Which is more loud?
Volume difference will be minimal, though the resonated is likely quieter. The resonator really just helps to reduce freeway droning.
Whats the difference between resonated and non resonated. I’m really new but I really want this exhaust. I’m not trynna void my warranty or nothing like that just love the looks and the sound of this thing! But I’m really confused so I’d appreciate the help!
The resonator will dictate the tone of the exhaust - it really has no impact on volume. A resonated midpipe will be smoother, deeper, and more refined, where a Non-Resonated midpipe will be throaty, raspy, and slightly higher frequency.
Neither resonator option will have any impact on the warranty of the vehicle.
I already have the ETS Extreme, no resonators and mufflers. Could I order just the mufflers of the exhaust?
Sure! We sell the rear section by itself on our website here in whatever configuration that you need - Catback Rear Section
I have a stock 2020 Sti and am looking to upgrade to the full catback exhaust with the muffler and resonator. There are not a lot of good videos on the sound for this setup and am just curious on how loud you would rate it out of 10 to stock? Also, does it pop and crackle on downshifts with the muffler and resonator? I am looking for something a little quieter than the extreme but still moderately loud and has the fun pops and am just curious if this fits that. Thanks!
The muffled setup is about a 6/10 where stock is 2/10. With the mufflers and the resonator, you will not get as many pops and bangs, but it will still provide a marked increase over the stock exhaust.
TK Auto did an install video on a 2020 STI with this same setup recently - https://youtu.be/bcXcaxpGxjs?t=647
I bought the ets extreme catback 3" exhaust (no muffler w/resonator) and do u use the stock doughnut thing for the straight pipe? Or are the 3 gaskets supplied are to replace it? (2022 wrx)
We send a combination of gaskets and an adapter that you can use to jump from the OEM downpipe outlet to our 3" catback, and you'll want to use them in this order:
Downpipe -> 2.5" Graphite Gasket -> Adapter Sandwich Plate -> 3" 2-bolt Gasket -> Catback
DO NOT USE THE OEM DONUT GASKET OR SPRING BOLTS - THIS WILL EVENTUALLY CAUSE A LEAK