Right so i'm after a decat pipe for a ZT conv. It's got all the running gear from a FRS so obviously i can pick a decat pipe up off the shelf.

My question is.. i have seen some that are 2.75" which flow better.. a) will this even fit to the flexi? and b) will the sudden step down in size cause pressure and give a little blow past the gasket..

This is probably stupid shit, but i'd rather buy once not twice.

Cheers Lads!