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Message: <blockquote data-quote="Simple Six" data-source="post: 1529968" data-attributes="member: 30662">Check out the Modularheadshop.com if you haven’t heard about them.They used to do NPI heads/cam stuff don’t know if they still do. As I remember the biggest draw back to the NPI motor was the intake manifold. Obviously the water coolant leak but it just didn’t flow even with forced air.The problem with the three year run 1996-1998 NPI it’s not financially viable for an aftermarket bolt on intake. The thing was the 4.6 NPI was the same engine in the cougar/Thunderbird so I believe the market was there for that era for a NPI aftermarket intake but I think Ford didn’t want performance competition for the Supercoupe thunderbird. The Bird/Cougar were discontinued in 1997 and in 1999 just like that the PI motor made it into production. People however do get good results with porting polishing heads etc. on NPI heads. The 1994-1998 Mustangs weigh in at about 3200-3500 libs. So 300-400hp at the rear wheels make it a fun car on the cheap with a boatload of aftermarket and restoration support. I’m with you it’s all about having fun.</blockquote>