zactech

Are you close to Edmonton? ABC Muffler & Hitch. They did a custom cat back on my truck and they are great!

Do you have dual out one side? I wonder if it would sound any different coming out behind each wheel? Maybe less loud?

I have the 18" Magnaflow 12288 and am going to change to the 22" 12588 next week. Too much drone and the 18" is just too loud for me. I'm hoping it will make it a fare bit more quiet but not too sure if just going with a larger muffler will do it. I might be better off putting in two resonators? Don't know. Any suggestions would help at this point.

I was told that the magnaflow 15269 will fit the 6'6" bed from Custom Truck, they have stock as well. I went custom made, it was 1/2 the price using the same muffler. Installed by ABC Muffler in Edmonton for $551 tax inc.

I think if you go cat back and stick to the longest muffler (generally more baffles) that is single in dual out 3 inch you should have less or no drone. Mine (video posted earlier) is loud and has some drone because I went small muffler and only 2.5 inch outlets.

Short video of 2014 Sierra 5.3L custom Cat Back using Magnaflow 12288 Muffler and 4" stainless tips just behind rear wheels. Drone under load at about 1,800RPM.

There is a slight drone on the V4, but mostly when it's on V8. Now' I'm curious, the third cat you are talking about is just before the muffler correct? I've heard people saying the third cat was by the tailpipe, but I'm sure that was just a resonator. What is "DoD", I'm guessing you have a tuner, which tuner is it? I'm worried about warranty issues so I'm not to inclined to remove the cat or install a tuner as I was told by my dealer if I do either it will void my warranty.

Had a custom cat back system built by ABC Muffler in Edmonton Alberta. Magnaflow 12288 muffler and dual 4" stainless tips tucked right behind each rear wheel, awesome job, but very loud, drones between 1,800 and 2,000 RPM under load. When you put your foot in it, man it sounds great! Might have to put a couple of small resonators before each tip. So heads up for anyone looking to make there 5.3 sound like a big block old school muscle truck.

I can't seem to find any cat backs for 2014 crew cab standard bed, it's the 6'6" box. I would prefer tips coming out behind rear wheels. Anybody know if the 15269 Magnaflow will work on my truck? I found one made by Gibson but I'm in Canada and can't buy from them. Any help would be appreciated.