hi to all, I would like to increase the performance of my nitro. I have installed the following modifications: k & n direct suction filter, enlarged throttle body, throttle body spacer, double outlet free exhaust at the rear. I have not removed the catalysts because surely the air sensors can cause problems with subsequent engine failure. I would like to install a control unit to increase horses or a control unit for the accelerator pedal as it is not always ready. I would not spend very sincerely .. However, if you have the kind of gift you are more than welcome.