well if they're really 440's, theres no way it would really run on a stock ECU. that means its throwing in almost twice as much fuel because the ecu still thinks they're the stock 240cc (give or take 10cc, i forgot the exact flow rate) injectors. it probably runs funny under boost because as soon as the fmu starts multiplying the fuel pressure, its just flooding the cylinders with even more fuel than whats already flooding them. we can play guessing games til infinity until you get it tuned and you find out where ur fuel trims/ratios are at on a dyno.

anyway, you already know it needs a tune, so let us know how it goes afterward.

as far as the s2k clusters go, they look good as long as theres a custom bezel created to bridge all the gaps, and of course everything is wired correctly. i cant stand seeing all these hardparkers and show guys putting in a bunch of fancy gauges and what not and have none of them hooked up haha