Originally Posted by
Gouky
honestly, nobody knows. you've got two ECUs on the same bus that are probably conflicting messages to eachother, you have both ECUs driving things like the main relay which i know won't produce optimal results. you have "start" stuff hooked up which nobody normaly has and it's hooked up to both ECUs.
and while your exhaust isn't restrictive, it also has no flex pipes in it and has evidence of carbon on the flanges which indicates leaking. normally not enough leaking to be a problem but you do have them placed right in front of the O2 sensors which probably gives an incorrect signal to the ECU.
we also don't know what you've done to the fuel setup. if you're using the stock MKIII setup you may simply be running out of fuel and the ECU is limiting power.