General exhaust tuning guidelines/tips

[Fidelity101]

Originally Posted by PercentSevenC

I think it would be good to link to the research Racing Beat has done on the subject:
http://www.racingbeat.com/Tech/Tech.Exhaust.2.htm


I'm not sure about the collected diameter you posted, though. That would indicate a collected diameter of 2.75" for a typical 2" primary setup, which is big. 2.5" OD is the largest I would go for a street-driven two-rotor, preferably 2.25" or even 2" depending on your porting and so forth.

Awesome link!

the particular collector above was suggested for another board member on his application. so depending on your power goals it will be different.

Just because you have a turbo doesn't mean you can just put any exhaust on, it does make it easier for exhaust tuning but when your not in boost your exhaust velocity is low but then again if your not in boost your probably not driving the car very hard at all.

I will post up a chart later that depicts what diameter you should use for your HP goals.