DPF & CAT Delete Pipe | GM/Chevy 6.6L Duramax LML 2011-2016

Fast shipping! very easy as long as you’re mechanically inclined should have no problem.

I originally only gave the kit four stars because I was missing a clamp but I was just informed that they have already shipped me another one! Five stars for a great kit and great customer service.

I'm writing this view because this kit only has two currently and I may be able to clear up some people's questions/doubts.

I'm only giving this four stars because you need three clamps and they only sent me two. You need the third clamp to clamp the end of the last section to what's left of your tailpipe after making the cut behind the DPF. The clamps they supply are very good. Unfortunately, I had to go to my local auto parts store and buy a U-Bolt clamp for that last connection. The U-Bolt clamp is not nearly as good as the clamps they provided and I have reached out to see if they can send me another one but have not heard back yet.

I bought the this kit along with the EFI Live tuner for my 2015.5 GMC Sierra. I was on the fence about whether to get the muffler or not because I was afraid it would be too loud without one but I also didn't want it to be as quiet as stock. I decided to go with no muffler and I'm glad I did because it's actually not that loud at all. Even on startup in the morning it's not loud enough to where you would need to worry about bothering your neighbors; its a low rumble. There's no drone, and with the windows up I don't even need to have the radio up any louder than I usually would. With that being said, you can definitely hear the turbo whistle and blow off which is what I was looking for! Do not go with the muffler unless you want the truck to be as quiet as it was stock.

The hardest part was removing the original system. If your truck is not lifted I recommend driving the front end up on ramps. You do need to make one cut on the original exhaust, in my case about 11 inches back from the DPF. If you want to get the cat out without dropping the transmission crossmember then you will need to make a second cut just before the cat. Once the old stuff was out, installing the new system was smooth sailing other than having to go buy a third clamp. I had no issues with the tune, but I will do a separate review for that.

Good product but instructions are not the best. For an extended cab, it says to cut 2" back from the DPF but there's a bracket there. You have to trim it a hair further back and it works.

Good quality & fitment.