seral guys I run with run the JP series exhaust as do I, never had any issues I run the JP-4 on my XT8 with a ws7x3 LG2 and the truck is a animal!...I run a AE 2035 on my rc8 buggy with a c6bb7t and have no issues eighter also have a 5.5 restrictor in it and its just a beat all the way from idle to the end of the straight. I was thinking of pickign up a pair od RB pipes but jeeze if they will unleash more power then I dont want them lol