With the recent release of our new product line for the 2015+ WRX we decided to hit the dyno with a local customer's bone stock WRX.
We installed a 3" ETS dual exit exhaust and Cobb Accessport with a Stage 1 flash for testing. It only made sense to us to test on Stage 1 because some it was a happy medium for stock, Stage 1 and 2. It also showed that gains could still be made without a Stage 2 flash.
We dynod the Stage 1 flash with the exhaust for a consistent baseline.
![](https://cdn.shopify.com/s/files/1/0568/5703/4945/files/2015_20WRX_20Stage_201_20Comparison_zpsg6q2xdaz.jpg)
255 hp / 275 tq
First we installed the midpipe which bolts to the cat-back exhaust and factory primary cat. The gains were substantial!
![](https://cdn.shopify.com/s/files/1/0568/5703/4945/files/2015_20WRX_20Midpipe_20Comparison_zps2bliqquw.jpg)
268 hp / 298 tq
![](https://cdn.shopify.com/s/files/1/0568/5703/4945/files/2015_20WRX_20Stage_201_20vs_20Midpipe_zpsou6xam1z.jpg)
Peak Gains:13 hp / 18 tq
Midrange Gains: 15-20 hp and tq
Next we installed the J-Pipe to delete the factory primary cat. We were happy with the power it gained again, but the J-Pipe really needed a Pro Tune to make power due to the computer learning that the cat was gone and slowly pulling back some power to compensate.
![](https://cdn.shopify.com/s/files/1/0568/5703/4945/files/2015_20WRX_20J-Pipe_20Comparison_zpsvyrionsc.jpg)
267hp / 306 Tq
![](https://cdn.shopify.com/s/files/1/0568/5703/4945/files/2015_20WRX_20Stage_201_20vs_20J-Pipe_20Midpipe_zpsw9q02e1c.jpg)
Peak Gains: 13 hp / 33 tq
Midrange Gains: 15 - 30 hp and tq
(Numbers compared to the baseline pull without midpipe)
Finally we installed our charge pipe kit. The results were most surprising to us
![](https://cdn.shopify.com/s/files/1/0568/5703/4945/files/2015_20WRX_20Stage_201_20Charge_20Pipe_20Comparison-1_zpsi7iu82hp.jpg)
286 hp / 330 tq
![](https://cdn.shopify.com/s/files/1/0568/5703/4945/files/2015_20WRX_20Stage_201_20Total_20Comparison-1_zpsewq4t1xl.jpg)
Peak Gains: 17 hp and 25 tq
Midrange Gains: 10 - 30 hp and tq
(Numbers compared to the J-Pipe/Midpipe graph)
Air intake temps were a consistent 79 degrees on the street under boost, even after numerous pulls. We also experienced an increase of 1.5psi - 2psi increased boost levels at peak.
Performed a few Stage 2 pulls out of curiosity with the J-pipe and midpipe installed, and a few more Stage 2 pulls after the charge pipe kit was installed.
![](https://cdn.shopify.com/s/files/1/0568/5703/4945/files/2015_20WRX_20Stage_202_20Total_20Comparison_zpstnk8s7ju.jpg)
![](https://cdn.shopify.com/s/files/1/0568/5703/4945/files/2015_20WRX_20Stage_201_20and_202_20Total_20Comparison_zpslmy5smqk.jpg)
Not much of a gain from Stage 1 to Stage 2 with our charge pipes installed
A Pro Tune would really squeeze the most out of these mods (of course), but our testing shows that substantial power gains can be had with these simple bolt-on parts.