Quote:
Originally Posted by GM-power
Cubic inches has nothing to do with what size exhaust you have.... your buddys truck has a new motor that will eat yours alive.
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Well stated. That 6.0 is putting out prolly twice the power the OP's 400 is making. Plus a lot of the newer trucks use double walled pipe (pipe with in a pipe) to keep noise down, so that make the pipes look larger than they actually are.