i have one on my truck i have a 1995 5speed with 3 1/2 inch pipe to 5inch tip straight pipe, and the resistor mod on my truck 1.5 resistor in it makes it lope awesome and sounds tough also throttle response is wicked but this resistor is to big and will throw the over boost codes sometimes but you go into your ICP sensor and take you some wire from auto parts and strip it back and unplug cap put wire in the hole then plug cap back in. after you do that run another wire to the wire that runs to the ICP sensor and plug into the where the wire plugs into the cap. i put mine on a switch so it was not on all the time so i just bout a waterproof inline fuse kit and ran my two wires to it and put it on an on/off switch. it works great i love it and you even can get a puff of decently black smoke out of it on take off