Okay i read the first couple of posts and i saw there was some cunfusion with the stock motor and the klze. first of all the stock motor is rated at 165 hp and you definatly do not get that to the wheels but the klze puts is rated at 200 hp and the different pistons instead of 9:1 compression the klze comes with 10:1 compressions pistons, bigger intake manifold, bigger intake ports in the cylinder head with bigger lifters also. the valves are the same while the springs are a little bit weaker. and as far as that stuff there is some differences in the VAF,EGR system and the ECU. i have the klze and im running on the stock a-spec ECU and the car is bad ass! i run a 14.22 at the track and im running with nuthing but a cheap short ram e-bay intake and exhaust tip on 87 gas. and its a much bigger imporovment from the stock kL motor! any questions...feel free to PM me i also have a klze for sale..or klze chip...or intake manifold........sorry im very quickly running through this reply...i will be back later to check for errors.