<font size="2" face="Verdana, Arial">That's not true. Is there a magical barrier at 2.25 for n/a 2.0Ls? No, a bigger exhaust will always provide you with more peak HP which is why apexi and HKS always dyno higher than other companies (because they use metric 60mm piping) which is bigger than 2.25 inches so you get that benefit. A bigger exhaust will always lose low end, people often just choose 2.25 cause it sits in the middle of losses on the low end and gains on the high end. I'd say a 2.5 inch exhaust wouldn't be that bad on this car, 3 might lose a lot down low, so i'd probably stay away from that. If your doing big power adders I'd say go with one of the 60mm systems or a 2.5 inch. If you decide to go big turbo 3inch or bigger is the only way!Originally posted by tools:
you will actually loose horse power by going to anything above 2 1/2". The exhaust cools too soon and causes lose of HP. Stay with 2 1/4"