Gazzo85

I have a 2012 f150 fx4 and I'm wondering which size glasspack I need to get for my truck

sportster07

Doesn't matter, any exhaust shop or anyone with a welder can make any of them work. I'd buy a 2.5 inch because adaptors to that size are very easy to come by unless they carry a 2.25, then buy that. As far as length, pick which one you want and go with it. The length doesn't really make much of a difference with sound, my truck wasn't much louder without any mufflers as it was with glasspacks.

BRUTE448

you should go read over in the 09+ or 11+ sec cuz 2.5 is not all of ur ex. i.e. my and all 11+ truck come 2.5 off flange to 2.75 int pipe then 3" out the back of the muffler

heres my write on my borla