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Message: <blockquote data-quote="scarface" data-source="post: 31229">the differences mostly are the heads, and intake. Allthough the PI H/I will bolt on the NON pi. The blocks are the same, the Non pi uses different pistons, causing the Compression to be increased. (more power, but requires high octain fuel)The fuel systems are different on them also, Non pi uses return setup, Pi uses returnless.Some parts wont bolt up. If you get a supercharger you need to specify which year. The ports are different on the pi, and the oil filler neck can get in the way also.Im not sure what year they started using COPs instead of coil packs.What parts are you trying to prove would/would not work?</blockquote>