I was wondering if I should keep the oem tail pipe on after putting the flowmaster 40 in. It's the 3" IN/OUT model and my piping as many of you would already know is 2.75". I'm buying a counter reducer to get it from the cat-back piping to the muffler itself. But should I go from 3" back down to 2.75 and keep the OEM tail pipe? Will it hurt Mpg's/performance? Anythings better than I'm getting now with a straight pipe :lol: but I was wondering if there's a common mod that people do when they're in this type of situation. Only reason I'd like to keep the OEM is because its less work and i already have the hangers there.