what exactly is the kn re0880 i hear so much about? Also the psychotty? I got 2000 qc 1 ton dually,auto, 33,000mi autometer egt and boost gauges on the a pillar and kn filter in the stock box. looking to do more bombs mostly in the intake and exhaust areas. Possibly plug and play down the road. Would a turbo housing change help and how much? Any suggestions please?