Boost loss due to improved exhaust.
Thanks for all the input guys. We are going to be working on the tune again pretty soon and I will either get it on a Dyno Jet or back to the track to see how it is performing. The dyno we are using for the tuning is a Dynapack and it will not give accurate power readings for an auto car with a loose stall.
I wouldnt worry about the drop in psi. What you should do is get a pulley that will get you back to the boost level from the previous dyno (10psi or whatever you said it was), go back to that same dyno, and see how much power you picked up at the same boost level.. that will provide the only answer you need.
Cool man. Yes, it was pretty loud. At idle was the worst, cruising and when you roll into it it sounded nice, just got tired of it at idle. You might like it though.
