The COBB Subaru J-Pipe for the 2015+ WRX is a direct replacement unit which features full CNC mandrel bent 304 stainless steel construction, a high quality metal spun catalytic converter, and an adapter for use with the factory catback. All of these features combine into an excellent replacement for the power robbing factory unit!
The COBB J-Pipe replaces what is traditionally referred to as the "downpipe" on previous Subaru vehicles. With the relocation of the turbocharger for the 2015+ WRX, the first section of exhaust no longer requires a downward turn but instead uses a sharp "j-turn" to route exhaust towards the back of the vehicle. During testing, we discovered when running a stock cat-back with an upgraded J-Pipe, there was a resonance issue when cruising at highway speeds. Thus, we have gone a step above and beyond to offer a resonated version to our customers that want to keep their stock cat-back. You can also use the resonated J-Pipe if you want to quiet down the turboback system!
Subaru SS 3" J-Pipe Resonated WRX 6MT 2015-2019
200 Cell Metal Substrate High Flow Cat
3" 304 Stainless Steel Construction with Resonator
CNC Mandrel Bent Tubing
Cat-Back Connection - 3" Flat Flange or Donut Adapter
Ready to Run with COBB OTS Maps
Subaru SS 3" J-Pipe Resonated WRX 6MT 2015-2019 is rated
4.8 out of
Rated 5 out of
Outstanding Fabrication and FitI just installed the resonated J-pipe for my 2015 WRX. The materials, fabrication, and fit of the J-pipe are outstanding. Connected to the Suburu accessory STI cat-back system, the total exhaust sound is outstanding with no annoying resonances at any speed/rpm. I installed the Cobb Mishimoto CAI/Cobb TBE 93, stage 2 map and am look forward to running a few datalogs after the ECU settles to get a true reading on added performance in near future. I settled on the Cobb TBE after doing much research and shopping and am very pleased.
Date published: 2015-11-18
Rated 5 out of
Reduce The RaspI originally had the COBB J-Pipe Non Resonated, but had a fitment problem and COBB replaced it with the resonated version per my request. I had quite a bit of rasp with the original J-Pipe. With the resonated version, it reduces the rasp and makes the car sound much more attractive. As with my other review, I highly suggest purchasing OEM Turbo Studs, Bolts, and Gasket as the nuts will strip out on you. I prefer this pipe over the non-resonated if using the stock Cat-Back.
Date published: 2015-11-25
Rated 4 out of
2017 WRX, great product, nightmare installAfter I installed the AP and Big SF on my 2017 WRX at 10k miles, it wasn't long before I decided to do the resonated j-pipe. The product delivered fast and as always Cobb quality is excellent. Before you start the removal of the stock j-pipe do a lot of research and make sure to purchase a replacement turbo bolt stud kit. This is a must. Im surprised this wasn't included by Cobb since its likely these will be needed as part of the headache to remove the stock set up.
I started my install by driving the car on ramps and removing the plastic tray and skid plate. Relocating the ground wire and removing the metal j-pipe braces was easy. Only use 6pt sockets for this project or you will have issues. The nuts that hold the j-pipe to the turbo are self tightening and were incredibly difficult to remove, even when using penetrating oil. I had to fight with this step for about 2 hours. The bolt on the bottom left of the turbo was seized and ended up pulling out the bolt stud. The bolt on the top right is almost impossible to reach. For this I had to use 2 extensions, a universal, and deep well 6pt. After 30 minutes I was able to make solid contact with the nut. Yay! Of course since the nut was practically welded on the the bolt stud as soon as I gave it force it rounded the top. Ugh. Total pain. I was able to remove all hardware EXCEPT the top right bolt. About 6 beers later, I decided it would be better to just throw everything back on the car and take to my buddy (who is a mechanic). Putting everything back took about 20 minutes and was very simple. My friend's shop was able to remove everything (even the mangled top right bolt) and install the new pipe in about an hour. Given this, I would have taken to him from the start. Probably helped that I loosened everything up for him. "First time tight, second time alright". Right now I am driving around with 3/4 turbo bolts secure since we're waiting on the aftermarket bolt stud kit to deliver. No exhaust leak, but Im going to take it easy until I have all 4.
Before I hit the road I updated my car with the new Cobb Stage 2+ Big SF map and WOW. I am very happy with the performance gains with this new set up. My goal was faster, not louder. This resonated j-pipe is great and provides much better response and power. I was actually surprised with how much I like the sound paired with my STI catback exhaust. When cruising its barely louder, until you stomp on it. On heavy acceleration you can definitely hear the difference. The tone and noise created fits well with the car and doesn’t sound like a slammed 93 Civic. The sound clips online do not give the Cobb j-pipe justice.
Better instructions, setting expectations for DIY installation, and including a replacement turbo bolt kit would have made for a better customer experience.
Date published: 2017-04-08
Rated 5 out of
Nice gurgle, popping at high-revs.So the Resonated J-pipe is 100% the way to go if you are looking for that low key, but ready to rumble exhaust sound. The exhaust notes are noticeable. In every gear revving the engine out to nearly 7k you will get an awesome popping gurgle sound. Amazing!!!! Also at red lights, pressing the gas to about 4k will also make the same sound on decel. I thought I left something loose and was having an exhaust leak. I am pretty OCD and checked 2 consecutive days just to make sure I wasn't crazy.
The craftsmanship: what can I say. It is built with precision and truly out ranks the competition. The only downside is the accuracy of how the two sections line up, including the gasket. Its pretty good, not superb but it will do the job without any issues.
The studs: be careful. Take your time. Mine came off without breaking nor stripping any out. I also used PB Blast.
The O2 sensor attachments are without a doubt perfect.
Overall this product is 10/10 in every category.
Date published: 2017-08-24
Rated 5 out of
Great improvementThis pipe plus the stage 2+ map made a nice difference. My turbo flutter is gone. I already had the air intake and the cat back system so I figured why not. Nice sound improvement but not obnoxious. I love the craftsmanship of these products.
Date published: 2016-11-23
Rated 5 out of
Less restrictionI still have my stock axle back on but when I switched to the Cobb J-pipe the car sounded deeper and was clearly breathing better. There are several less restrictions on this pipe including the size. The installation was fairly easy and the cars horsepower definitely increased.