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Message: <blockquote data-quote="MustangChris" data-source="post: 729954" data-attributes="member: 10830">"PI" means "Performance Improvement"in 1999 ford released a new tumble-style head and intake manifold design on the mustangs. They got a big bump in power and respond much better to basic modifications. Up until about 6 months ago, PI heads were the only heads used to "build" a 2v mustang (although i guess there could be a few die-heard npi [non-performance-improvement] fans out there somewhere...) Now trickflow has released a set of heads that perform better than the PIs.to get a 1996-1998 GT to perform like a 1999-2004 GT takes thousands of dollars of modifications, unless you are doing the work yourself and/or have great access to used parts. my 1996 GT would beat a stock 1999-2004 GT by roughly 1 car length. I had full bolt ons AND a fully built rear end.Intake: $200.00Headers: $150.00x pipe: $300.00Cat back: $200.00UD Pulleys: $175.00clutch: $300.00driveshaft: $300.00ignition: $200.00fully built, professionally installed rear end: $1200.00*OR*PI Swap:heads: $200.00cams: $50.00intake manifold: $100.00(got a professional quote on istall, said just removing the heads was $1200.00 but taht was YEARS ago..)buying a 1999 GT is about the same price as getting a 1996-1998 GT to beat it... unless your a grease monkey.</blockquote>