:thumbup Got my 88SC back from the shop last night after they installed the Dynomax exhaust and I can't believe the difference in the responsiveness of the car, not to mention the sound (thanks Brianlp). Apparently that was one of the problems with the HKS cams, they just weren't able to "breathe" (or should I say "exhale") with the temporary exhaust I had on there (2.25 NA muffler). I'm gong to move the intake out of the trunk to see if that helps the Intake side. The car still seems to smoke some on hard acceleration, but not nearly as much as previously, but it was night time so I can't be too sure yet. I also noticed a big difference in the blue smoke issue after I put the O2 sensor back on. The shop had "forgotten" that I didn't bring it with the new muffler and so they blocked off the bunge! On the one remaining problem---the max out at 6,000 rpm's, the rev limiter cut in at 6500 on the tach so I think the car is revving properly, but the tach is not reading the rpm's correctly? Anyone have some insight on that? TIA