Project Gen 3STi: Testing the COBB Down Pipe and Exhaust

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Project Gen 3STi: Testing the COBB Down Pipe and Exhaust Project STi AccessPORT COBB Tuning AMS automotosport rallysportdirect proto down pipe GR cat-back exhaust MotoIQ Certified Legit
Our trusty AccessPORT allowed us to re-flash our ECU to safely use our new mods in roughly 3 minutes.

 

After putting the car back on the ground we used our AccessPORT to upload the Cobb Stage 2 93 octane map, the car fired up without issue and I finally had a chance to hear the Cobb exhaust for myself. I was pleasantly surprised at the lack of racket! A nice low tone and just a hint of the Boxer rumble. We took the car out on the road to get it up to temp and then returned to let the car cool down. so that we could double check the torque on the downpipe and exhaust joints. So how does it really sound? Daily driving the car the exhaust is easy to live with as it has almost no drone even when cruising at highway speeds and it actually sounds good at WOT. Having heard quite a few Subaru exhausts in the course of auto crossing and running HPDE and time trial events, I can honestly say this is my personal favorite. I also prefer the look of the Cobb muffler as it resembles the stock layout rather than the tilted grapefruit launcher approach. The goal of this car is to create an all around performer that also functions as a family car when it needs to, thus the Cobb exhaust is the perfect fit!

Project Gen 3STi: Testing the COBB Down Pipe and Exhaust Project STi AccessPORT COBB Tuning AMS automotosport rallysportdirect proto down pipe GR cat-back exhaust MotoIQ Certified Legit
Our installed turbo back exhaust! The cleaning paid off as after a few weeks of use the exhaust is getting a nice golden hue. 

 

We once again called upon our friends at AMS to have Mitch help us with a baseline with the new Cobb stage 2 MAP as well as an AMS pro-tune. After the last instalment our STi was making 245 Horsepower and 271 LB FT of torque to the wheels with the AMS optimized MAP on their AWD Mustang dynamometer. After strapping down the family wagon Mitch hooked up the AEM wideband and got out his trusty laptop. Using the Cobb stage 2 93 octane base map the car made 256HP and 294 lb ft. The Cobb map worked very well and removing the downpipe and exhaust restriction really allowed the turbo to come on sooner and allowed us to hold boost all the way to redline, whereas before the car would die up top as the boost fell off. Mitch then let his fingers do the walking and after a few pulls and logs the car was able to put down 261hp and 301lb ft. We were also able to make a good amount of power in the area under the curve through optimizing the AVCS. Instead of talking about peak # this and that I will let the dyno charts do the talking. 

Project Gen 3STi: Testing the COBB Down Pipe and Exhaust Project STi AccessPORT COBB Tuning AMS automotosport rallysportdirect proto down pipe GR cat-back exhaust MotoIQ Certified Legit
The first sheet shows what one can expect with simply using the Cobb AccessPORT base maps. Real world results of our baseline pull, Cobb Stage 1, and Cobb Stage 2. It is important to note that we have the stock intake and OEM filter still on the car. 

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