6.2L MagnaFlow Exhaust, Sprint Booster & CAI Follow up

1972c10Custom · April 9, 2015

When I bought my 14 Sierra my dealer installed a sprint throttle booster and a magnaflow cat back exhaust #15318, I demanded a refund after they cut off the factory flange and welded it to the 15318 kit claiming the magnaflow flange did not fit. I had a 22" magnaflow muffler installed removing the resonator and flapper with a 3" pipe after the muffler, it sounded great for a few thousand miles, nice and mellow! but after a summer of towing a 8500# camper, the exhaust decibels increased to the point I had to buy a Diablo tuner to tune out the AFM because of the annoying helicopter sound while normal cruising...do not buy the sprint booster the Diablo Tuner is less money and has more options and really wakes up the 6.2. I recently had the magnaflow cat back exhaust #15318 properly installed by a authorized magnaflow exhaust shop, it sounds awesome nice and mellow under normal driving, but under heavy throttle its aggressive, must be the 4" pipe after the muffler and resonator. As the CAI goes, IMO do not buy a Volant CAI or equivalent open CAI, the Volant sound like a fog horn so I removed it and installed a MIT tube, the sound is minimal under both normal and heavy throttle. When I have time I will post pic's and vid's of the exhaust.

desert · April 11, 2015

The airbox mod would provide you with some extra airflow.

Stoddard · April 16, 2015

When I bought my 14 Sierra my dealer installed a sprint throttle booster and a magnaflow cat back exhaust #15318, I demanded a refund after they cut off the factory flange and welded it to the 15318 kit claiming the magnaflow flange did not fit. I had a 22" magnaflow muffler installed removing the resonator and flapper with a 3" pipe after the muffler, it sounded great for a few thousand miles, nice and mellow! but after a summer of towing a 8500# camper, the exhaust decibels increased to the point I had to buy a Diablo tuner to tune out the AFM because of the annoying helicopter sound while normal cruising...do not buy the sprint booster the Diablo Tuner is less money and has more options and really wakes up the 6.2. I recently had the magnaflow cat back exhaust #15318 properly installed by a authorized magnaflow exhaust shop, it sounds awesome nice and mellow under normal driving, but under heavy throttle its aggressive, must be the 4" pipe after the muffler and resonator. As the CAI goes, IMO do not buy a Volant CAI or equivalent open CAI, the Volant sound like a fog horn so I removed it and installed a MIT tube, the sound is minimal under both normal and heavy throttle. When I have time I will post pic's and vid's of the exhaust.

So you have the 4" Magnaflow kit with muffler and resonator now?

1972c10Custom · April 17, 2015

Yeah, Magnaflow kit #15318...3 1/2 from cat to 22" polished stainless muffler exits 4" into 14" resonator then 4" exit pipe to a 5" single stainless tip...sounds bad ass! turns allot of heads when I'm driving, it is mellow sounding if you don't drive agressive, cost me $750 which included the install, Magnaflow is less money than Corsa or Borla and sound and looks better IMO. I have AFM tuned out but I did drive a few miles with AFM on and there was no drone!

zert100 · April 25, 2015

Yeah, Magnaflow kit #15318...3 1/2 from cat to 22" polished stainless muffler exits 4" into 14" resonator then 4" exit pipe to a 5" single stainless tip...sounds bad ass! turns allot of heads when I'm driving, it is mellow sounding if you don't drive agressive, cost me $750 which included the install, Magnaflow is less money than Corsa or Borla and sound and looks better IMO. I have AFM tuned out but I did drive a few miles with AFM on and there was no drone!

How do you like that exhaust when towing? I'm considering the same system. I do quite a bit of towing in M5 on the Hwy and am conserned about to much noise in the cab with some of these catback systems. I also have the AirRaid tube and filter. Seems like you got a really good price on yours.

1972c10Custom · April 27, 2015

I have not towed my camper yet, so far I love the sound and the looks, mellow when cruising and very throaty during aggressive driving. As far as pricing goes, the prices on the I-net are retail, find a Magnaflow shop/dealer and offer them $750 for #15318 installed, Im betting most will accept.