We just swapped out the standard FG turbo for a 35/40 cartridge and ported the wastegate at the same time. Problem is boost hits 18PSI but tapers off to about 12psi at redline. We have all the standard supporting mods ie cat, injectors, intake, xcal but have kept the STANDARD INTERCOOLER. We have tested the wastegate actuator and checked for any intercooler/BOV leaks on the dyno. Do you think the standard intercooler could be hindering the performance that much, if not what do you think it could be? We were thinking next to check the cat, it is however only a 6 month old 100 cell cat? G6E TURBO 35/40 ID1000'S XCAL MODIFIED INTAKE K & N 100 CELL CAT MACKAY - DAVE S