EFILive has graciously provided COS to allow for 2 and 3 Bar MAP sensors for those running forced induction. The question that I have is what are you using for rev limiting on those setups (I am assuming that you are using a DBC setup)? Standard RPM limiter in an LS1B is to cut fuel .... which makes an engine go lean .... which is REALLY bad on a forced induction setup. Ideally we would want a spark cut.