I got the zex kit, as well as my friend with a GT. I installed it on his car with no problems at 55 shot. It works great. The only issue was having to buy extra tubes of rubber at an auto parts to put around the included fuel tee, to connect it inline to the car's fuel line (and with mini clamps of course). So I don't have to cut my fuel line, I'm waiting for my OBX Fuel Rail until I install my zex kit on my GTS.