yesterday we stuck my mates 33 on the dyno. it has a fmic, turbo back exhaust, pod and a 3076r (IW, 0.63a/r). we were tunning the boost controller at 16 psi and it made 290hp but it was bleeding off boost back to 12psi at redline. it was making max power at 14psi at about 5500 rpm.
we thought it may have been the boost controller so we disconnected the hose to the wastegate to run open boost. no real change. it went up to about 18psi but then bled off back down to 12psi and there was about 1hp difference in power.
now we know there is a restriction but we aren't sure where. we know the cat is a bit screwed, but not sure how bad and it is on the 'to do' list. i'm also thinking it may be the fmic as i don't think it flows very well. it uses the stock piping but the core doesn't seem to be that good IMO. the air comes in the top (from the side) then has to do a 90 degree turn into the core, then has to do another 90 degree turn at the bottom to exit out the same side it came in. i think a cross flowing cooler would be an improvement. we are going to put a boost line in before the cooler to measure the difference in boost pressure between the 2 sides.
we know it isn't the pod, because we took that off and lost nearly 10hp, but i think that was more to do with heatsoak.
so any ideas you have would be welcome.