i've looked at a ton of nitrous kits for the crossfire including all the add on accessories for safe usage. i've also met up with pusperti and took a ride in his car with a 75 shot! very impressive. anywho the kits i started leaning toward were the zex kits the hole system is controlled through module that takes most of its info from the the cars TPS sensor. on top of this they also have a seperate available rpm switch that you can acutally adjust to turn on and cut off the nitrous at any set rpm! perfect for us manual guys and also helps with traction control issues. one more additional safe move id do is wideband air fuel just to reassure that everythings ok. plus one of the aem guages with the black face, red pointer, and green background would look sweet with our factory guages. i've also read that a 75 shot is more then reasonable match for this v6 engine i don't think id dare to go more without a some kind of timing retard but 75 horses is plenty of feel! so if used wisely i dont see how this setup would cus any harm to your vehicle. i've yet to purchase because of chosen to buy wheels and springs first. but when i can afford it i'd like to do this setup.