Trying to understand the cumulative effect of breathing mods

SS_Firehawk

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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