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Key to getting the most power out of any turbocharged vehicle is to make a free flowing exhaust system to get rid of the spent exhaust. The first in most clients wish lists is the cat-back exhaust for their car, and with 8 years of experience and we understand what i takes to make a sucsessful exhaust. Like our other exhausts, the EVO 10 catback is built with 3” 304 Stainless Steel tubing, which passes through a stainless steel muffler and ends with a dual 4” tips. All mirror polished for that show look. (But we do offer a Stealth Black System for those not wanting to show off too much. The sound is mellow and smooth. Loud enough for you to know it’s working, but not loud enough to raise suspicion. No droning at free way speeds either. Another great feature of the PERRIN catback is the weght savings! The OEM catback weighs 43.5lbs and the PERRIN catback weighs 27.4lbs. That is a huge savings of more than 16lbs!! DYNO TIME We saw 20WHP in some parts of the RPM band, and a pretty good average of about 10WHP. One really cool thing, as we expected, was the turbo spooling a little quicker. This made for about 50ft-lbs of torque gained at 3000RPM. Below is the graph showing our Stage 1 ECU flash with nothing changed but the catback exhaust. Next we left the PERRIN Catback on along with our Stage 1 flash and as quick as we could we bolted on the 3" downpipe with 3" high flow cat pipe(CLICK HERE FOR MORE INFO) . The most interesting thing is peak power didn't change much nor did peak torque. But the power was much more smoothed out, and much broader power gains were had. Meaning, we still got 20WHP, but as you can see below the area of 15-20WHP gained was much larger. Below graph shows Stage 1 with no exahust versus Stage 1 with both PERRIN catback and Downpipe. Our cat-back is a simple bolt on item, that requires, nothing more than simple hand tools to install. No need to trim the bumper, bend a bracket, or anything. Literally unbolt the OEM system and bolt the PERRIN one in its place.