I went to the dyno this morning to tune up 440's safc and msd. the ecu threw a check engine light for the map sensor which we found to be not connected to a pressure line and broken anyways. We installed a new gm 3bar and everything was electronicly sound. then every couple of starts it would throw the light and we would have to reset the ecu because it wouldn't clear. (All the testing to that point had been at 8psi) Now the boost got turned up to 18psi. With everything working perfect I only hit 230hp at the wheels (dynojet dyno). The guy showed me some graphs of other cars with similar set-ups that were hitting closer to 300hp and the torque was maxing out about 2500 rpm earlier. before I take it some where and start spending money ripping apart the engine what could possibly be wrong that doesn't show up on anykind of sensor. the spark timing was about 21 and never got higher than 23. The engine timing is i believe 4deg retard on the exhaust and 2 deg on the intake. His theory was either an incorrect timing belt install or cam shaft. My theory is *$( %&* %$#*%# $%%#$*&