You might want to do some calculations and see if you really need a 2.5 inch pipe. I am using a 2.25 inch pipe on my 1.8L engine and would only go with a 2.5 if I was going to be turning over 7K or I had a 2.0L or bigger engine.
On my last race car, a 5.0L V8, I was making over 300 HP using 2.5 inch pipes from the headers with a "X" pipe crossover and never felt that the exhaust was a restriction.
To big of a pipe will hurt midrange power.
Of course individual cars vary with types of engines, power range, trans ratios, and final drive that may allow a driver to keep an engine in its best power range better then another car. In that case reving the snot out of it might be the best bet!
1988 ITA Scriocco 16V #80
MCSCC member since 1988
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