All I know is that OBD2 controlled motors have a tighter hold on the engines performance due to extra sensors and more tightened regulations as to what you can do.

Basically I want to replace the OBD2, that way I will properly be able to read 500 hp without problems. The stock MAF has a limit of around 450. Besides that I want to install a BOV that vents to the air. So getting back to the GM MAF, does that replace the OBD2 or work in conjuction. Or do I need a upgraded ECU to replace the OBD2?

PS I have already purchased many of the BPUs and am tring to get fully informed and prepared for future upgrades. Time will tell as to what happens. I'm reading the posts and other dsm sites though not just asking questions. Thanks for looking out though.