I once saw a guy take off like a rocket ship in new york state once with one of those. What was suprising is there was not even a lot of smoke. He was on a parking lot next to a highway. I initially thought he must have been a gas car. But the right label was on the trunk. Anyways the help to slow it down is available here for the asking. I would get the overboost functional. No sense taking risks. It could evolve into a head trip. Edit: sorry I was reffering to an 86 or 87 with the alloy head. I just automatically thought that was what was meant.Until I re read the post.