My "cat" fell off one day, still have a Magnaflow muffler. Exhaust is a little louder not much but pulling a 15000# GN mileage has improved about 3/4 MPG, local driveing empty no noticable difference. I do have a friendly dealer and I if needed would return truck to stock before dealer would see truck for warranty. bob...............
Bob O.
2004 K2500 DA LLY CC LT LB Wow! Edge w/A + BS + CAT pre fuel filter, 06 air box,
2002 C6500 EC. 7.2 Cat NoMar rollback/ 92 C7500, 7.2 Cat, 25ton No-Mar / 2005 C5500 D/A rollback / 1969 Corvette 350-350 4spd AC T-top stock orginal
XP850LE WOW nice ATV, 09-550XP hers, 03-Predator, 04 Honda400EX, 05-Banshee, 08-KTM525, 08 KFX700, 38' enclosed GN hitch