Looking to see what is a better option for me I know there is a price differance and am willing to pay for the better option. This is as far as I am going with he car for mods I have another car that I will mod farther. I now have Headers DP no Cat, FWI 180Tstat, Transgo Shift Kit, will get colder Plugs and a 3.4 mabey 3.3 Pully that is all I want to do with the car. This is a 01 GTP. I have a Scan Gauge Aeroforce to look for knock after. Just looking to see if the extra money for the Overkill is worth it.