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Message: <blockquote data-quote="MadStang" data-source="post: 503441" data-attributes="member: 10532">That number is actually low. Most 7psi procharger kits for the 99-04 mustang stock put out about 280rwhp/rwtq. Hell even the less efficient vortech puts out about 260rwhp/rwtq on a stock mustang setup. If you get the 11psi or 13psi kits you'll be well into 300whp range.Stock 99-04's with procharger and street tires with a 5-speed will run high 13's all day with the 9+ psi kit. With gears and other bolt-on's low 13's, high 12's are possible.The best bang for buck is the Procharger. It's not 14 year + old equipment from oem Ford and is backed by a warranty from ATI if something goes wrong. It's much more efficient than the m90 and much less of a hassle for install. Even if you were to pick up a running block, there are ALWAYS quirks to work out and I like to run a motor that I know exactly how it reacts, which, is exactly why I'm running the stock block with built internals. I know what my motor can take and how it reacts to certain inputs.See my above response for the heaton m90. Easily get to 300hp with lt's, porting and pulley? Porting alone is going to cost you an arm and a leg for the blower. And the M90 is by far not the cheapest and not even close for the bang for buck either. Finding all the parts that are actually needed for the swap is difficult in itself. And swapping an old motor into a car that is newer is also another pita. Trust me, avoid the M90 if at all possible.Why would he be disappointed with the performance of the stock split port? They're rated to 400bhp. He can safely run 350bhp with no problems either. Using a 9 or 11 psi kit will put you at around 300whp with a solid tune. I think that's the bang for buck especially when the kit can be done and installed for $2k including gauges (wideband, boost, etc.) And he will not be disappointed with the performance of a built split port either. No one has blown up forged internals from many of the companies that sell performance blocks and they're running insane amounts of boost. The fastest v6 mustang, is running 30psi and it's still running strong. The 3.8 block itself is ridiculously strong and with internals and head gaskets made for boost they're virtually indestructible if you treat them correctly.Personally, I like that I built my v6 rather than buy a GT. It's much more rewarding, especially on the autocross track when I'm scooting right by GT's with more power. I provide embarrassment.</blockquote>