Check the ground wires at your Bcm.
I can be flashed back to stock by the dealer. Worst case.
Drone reduction is what the resonator’s purpose is.
You actually want some colour change in the oil believe it or not, I prefer it to be dark brown definitely not black. I believe what you are hearing is cold piston slap. One there is enough thermal expansion in the pistons, there is literally no noise. Let it warm up a bit more before driving or keep it under 2500rpm until it warms up.
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Remove the third cat instead. That will not cause any drone and will give you a bit more noise.
I experienced with the Airraid MIT that the factory airbox became a restriction after adding headers to my 6.2. There was a noticeable seat of the pants(wheelspin) difference and airflow volume increased when comparing back to back datalogs. I've since lost the datalogs in a laptop hard drive failure. Personally I ended up cutting up my factory airbox on the lower front corner to open up the factory box behind the headlight and below to the fender well area. No pics again.
I emailed air raid tech support since mine was falling off the throttle body once a month. They had me send a picture of the mit installed. They promptly sent a more flexible silicone coupler and I haven't had issues since.
Cut out the 3rd cat for a bit more noise. There are greater power gains in long tube headers instead of catback exhaust. Personally I tuned my truck first, then removed the third cat for a bit more noise. And now I installed long tube headers. With the stock exhaust, I have no drone, my exhaust note is slightly louder at idle. On the highway I can hear the headers 'tick noise' over the exhaust, I certainly have no drone whatsoever. If I step on it, it is angry as all hell.
My Kooks with the high flow cats made my truck throw P0420 and P0430 codes. I did a new datalog and sent it into Blackbear. With some patience I got a retune. After I updated my tune, my fuel mileage is better than ever, idle is smoother and the truck behaves like it should. I would not recommend putting headers on and not retuning the truck based on my experience.
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