Quote:
Originally Posted by XfireZ51
Paul,
Let's not forget that no less an expert than Marc Haibeck continues to say that
he feels there is no practical loss in performance between a 2.5" Corsa system vs. another 3" system.
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While that may be true, as well as the fact that most n/a cars need SOME restriction to maintain low end torque, I do not think what is shown is what Marc had in mind.
It is one thing to have a "free flowing" 2.5" exhaust, and something entirely different to have a 3" exhaust flowing into a 2.5" restriction, and back to 3" again. Restrictions like this create turbulance in the exhaust flow and disrupt it's release. Think about it, what are the benefits of a mandrel bent system v. a crush bend?
If it were mine I would remove the restriction, and make the entire system no less restrictive than the header outlets themselves, or you are really gaining nothing imho.