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Message: <blockquote data-quote="Dalamar" data-source="post: 6834" data-attributes="member: 8116">Here's some info from powerheads - where I got my PI's"Pre 99 heads had small ports and valves, and large round 52cc chambers. Camshafts in these heads were only .460Ã¢â‚¬â„¢Ã¢â‚¬â„¢ lift with short spring heights, you CANNOT install high lift cams in these early heads."I gained 95 HP, NA, average tune, high elevation.THere are guys that have got 132 RWHP gain from PI heads, cams and a good tune.That's more than you can get from most Superchargers on the NON PI's setup.Case closed for me.Another hyped up point about the PI swap is that the compression will go up!!!!!!!!!!! aaaaagh, noooooo.SO WHAT. the modular loves high compression, It's a benefit. If you get detonation, it is due to a bad tune.</blockquote>