First of all my truck came stock stock with the rousch racing tips which I think look sweet. I'm assuming the stock pipe is 2.5 inches from the headers back. So the tip is setup for this diameter. Is it going to make that much of a diff if I go to a 3 inch catback system? I was thinking about just changing the muffler to a flowmaster 20 or 40. Not sure which though. Anyone got any ideas?

------------------
1998 F150 Nascar Edition
RC, 4.6L, 3.73
Current Mods ... Superchip