Hey guys. Just got my 07 TL a few months ago and I'm looking to replace the exhaust and make it look more like the type s with the dual. Wondering if I should go through the dealers body shop to do this or through someone local. I'm still under warranty and don't want to void it. I'm assuming I have to replace the rear bumper to fit the dual exhaust as well. Any ideas on overall cost to do the new exhaust? Thanks!