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This week my 6.0 has stated varying a couple hundred RMP up or down at low idle (pretty rapid), once at higher constant rpm there is no fluctuation. I am not reading any codes and my SCT livewire isn't showing anything abnormal. Please help.

I have 4" MBRP exhaust with the MBRP muffler. I want to install a 4" QTP electric exhaust cutout before the muffler. Once concern would be exhaust/sound coming from directly below cab when open. Anyone done this or have any advice. Thanks

When I am at 750 rpm there is a vibration/rattle from beneath the cab. This only happens when I am in park,drive, or reverse. It makes no noise when at 750 rpm in neutral. My guess is it would have something to do with the torque converter. Other than that the truck runs/sounds smooth in drive...

I let my fuel get pretty low and as usual had some trouble (slight stuttering) starting this morning. After I re-fueled when I went to start there was a very loud clicking/grinding noise. After another try I got it started and everything ran fine. I ran it pretty hard and shut it down. When I...

I'm looking for a +/- 37" x 12.5" x 18R All terrain that is moderately aggressive but gets good wear and decent gas mileage. I currently have 35x12.5x18 Nitto Trail Graps but want something a little less aggressive. Any suggestions or testimonials?

Just got on this site and have an exhaust question. I am looking to install either a 4" turbo back diamond eye or MBRP. I want the exhaust to sound good/deep when I step on it but do not want it to be overbearing as I use my truck for work meeting often. Do I need to keep a CAT or will either...