[XfireZ51]

Originally Posted by todesengel

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.

That's 2.5" OD btw.