Originally Posted by TopgunZ

The real gains have already been made by swapping out from the stock exhaust. The straight through design of any good forced induction exhaust doesn't really create that much of a restriction, unlike the stock exhaust. It might pick up a couple more ponies but nothing that would be looked at as inflated numbers by just removing the rear cans.

Inflated numbers are when you remove a known to be restrictive air filter entirely like some places have done and then post up numbers saying your kit makes 80whp more than the competition. I don't operate that way.