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Message: <blockquote data-quote="Ronin" data-source="post: 778586" data-attributes="member: 12714">So a quick recap since I've been quiet for a while.Bought 96 GT with Procharger P1SC already installed with 12 PSI pulley.Time went on and I started noticing it wasn't hitting full boost any more. Was hitting about 10 PSI. Started dropping. Got a CEL that it was running lean.Was only hitting about 6 PSI (and then creeping from there) when I took it to the shop. Had the shop remove the Diablo chip and put in and tune their own chip, CEL gone. Had them put an 8 PSI pulley on since 12 seemed a bit too much. Replaced rear seal on P1SC, the belt (was missing a full tooth), and another squeaky pulley. Shop tells me it's still only hitting about 6 PSI because of too much back pressure caused by stock cats (6 of em).I now have a Pypes X pipe (O/R) in place. Pressure is still around 4-6 (followed by creep). P1SC is not making any peculiar noise (just that beautiful whistle at idle).When I had it in to have the chip/pulleys/etc. done, they also mentioned that the IM, though still working, will probably need replacing soon. Is it possible that a leak at the IM would create a limit in boost? I'm grasping at straws here, everything else seems good.</blockquote>