Whats up guys, i just recently finished my turbo install and im having a few problems, its a 91 si hatch with a jdm zc swap....garrett t3/t4 .60 trim, xs power manifold, turbonetics deltagate mark 2, starion fmic, turbo xs boost controller, blox missing link, fake greddy bov, custom pipes, custom downpipe. when i first put it on the down pipe what about 6" long, before i took it to the exhaust shop, the turbo was spooling to about 8 or 10 psi...thne it would sppol to about 5 or 6psi. after i took it to get the exhaust done, i put the o2 sensor back in. now the turbo will only spool to 2 maybe 3 psi, ive pretty much ruled out leaking intercooler pipes and bad wastegate. im not sure what the problem is...not enough compression?(the car ran strong all motor), too much back pressure?(2 1/4 piping, high flow cat, high flow resonator, straight through canister) any input would be greatly appreciated.Thanks a lot guys!