I ordered a Flowmaster muffler today. I ordered the 40 series single in, dual out. The question I have is will there be any problem using this for in a catback system, because the single in is 3" and I'm pretty sure my exhaust is 2 1/2" all the way through. I have the 4.6 engine. Has anyone had experience with this?

cd

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Silver 99 F150 XLT Sport Extended Cab with Flare Sides...
Mods: K&N Air Filter, Tinted Side Windows, Reese Class 3, Airbox Mod's, Alpine Deck & Subwoofer Processor, Zapco AG350 Amp, JL 10W0 (times 3)
Coming soon: Flowmaster 40 Series Catback System, Spray-On Bed Liner, Fiberglass Tonneau Cover

 

If they don't send you a reducer (2 1/2"-3"), you should be able to purchase one at Pep Boys or another auto parts store for a couple of bucks. They are readibly available. This would be a minor inconvenience, not a major "show stopper" during your install...