Hey guys I just had a quick question for you all. My dad has a 1999 2500 4x4 auto(46,000 miles) with Edge E-Z, AFE Intake, Banks Brake & Smart lock trans brake. Any way his truck will heavily soot the driveway with thick oily soot while idling even with banks brake off. So what do you guys think is causing it? the Edge box or maybe a failed turbo seal. Any help you can give me would be greatly appreciated.