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Trying to understand the cumulative effect of breathing mods

Originally Posted by tylerk So are you saying that for a DD, you would recommend keeping the stock exhaust (non-nismo touring sport) as apposed to upgrading to say a Fast

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Old 01-27-2013, 01:16 PM   #7 (permalink)
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Originally Posted by tylerk View Post
So are you saying that for a DD, you would recommend keeping the stock exhaust (non-nismo touring sport) as apposed to upgrading to say a Fast Intentions CBE?

I'm not disagreeing with your post, just curious why everyone raves on performance gains from this particular product. Maybe it's the aesthetics that everyone likes with this mod?
What Jcosta was eluding to was being naturally aspirated, 2.5" is the best size for the car. 3" is best for forced induction applications making 650+ bhp.

Example: Our car's stock exhaust is a coffee straw. 2.5" exhaust is a regular straw, and a 3" exhaust is a water hose. Blow through the coffee straw and sure you get velocity, but there is a lot of back pressure. Blow through the regular straw and we still have very good velocity, but we also have much less back pressure. Blow through a water hose, the size of the hose is so large, there is very little velocity and no back pressure. It's too big to be efficient for the application.
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