I know, sounds like too much, but according to Innovative Interceptors we already have 3.5" and if I'm wondering if anyone has ventured out and gone with a larger tip. I may get non-resonated tips depending on how my new muffler purchase works out, and I recall a few posts regarding a massive 4" exhaust tip but I don't think there was any outcome.
My tips are extended out about an inch, maybe an inch and a half, and I was there holding the tips with my hands wedged in the bumper cutout to ensure proper alignment - we have the room for 4" tips if we wanted to use it. I wonder what 460 crank horsepower sounds echoing out of a 22" long 4" wide non resonated exhaust tip.
Magnaflow has 4" tips (non-res) that are within two inches (IIRC) of our current length with an ID of 2.5" (1/4 inch larger than our stock pipe's OD) but that isn't much of an issue at the exhaust shop. Rolled lip or slash cut, Magnaflow has it, and so does the Magnaflow dealer down my street.
Keep in mind our tips from the factory are rolled at it's lip, so it doesn't look like a 3.5" tip to me...I wouldn't see why a .5" increase would seem like a mammoth under the bumper in fact it would fit that opening quite nicely...
Has anyone tossed out the stock tips for something larger, or without a rolled lip that can supply pictures?