The pipe upgrade is next. Between the MBRP, Bully Dog, Silverline, ATS, Magnaflow, Flowpro, Diesel Pro etc. etc. what is the best one to get? I don't want it to sound like a dump truck just want to lower EGTs and upgrade the sound a little. It looks like you can get the T409 SS, MBRP 4" with 5" tip for about $500 at usdieseleparts.com Any suggestions?