i put on dp with high flow cat, glass pack in place of resonator, cai. autolite colder plugs. 93 octane, 180 thermostat, runs like a scalded dog. surprised me.( i have a 3800 perf ecm and modular 3.4 pully in trunk) due to all the good advice on this forum i am going to make sure before going furthur, read up as much as you can, dont blow your engine with kr. thanks to all forum members who have been through this the painful way for all their advice. dont rush it, i;m kicking arse now and lovin it.