I am shopping for and exhaust system. I have an '06 Chevy Silverado 2500HD LBZ Duramax/6sp Allison 1000 ec sb 4x4, bone stock. I want a turbo-back 5" stainless mandrel bent system that has a deep rumble, little cabin drone, no low rpm loss or codes, and good fit without heating up shocks or spare tire. Is this too much to ask? My other option is to go to the local muffler shop and have them design me a custom 5" mandrel bent stainless pipe with no cat or muffler. Thanks in advance, and what possible products do I need to block the EGR or erase codes?