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I would love to fit some RS4 heads, but dont have the money to them The 2,8 heads have bigger ports than the S4, so that is the way I want to go.. here is a really good read my friend http://www.rs246.com/index.php?name=PNphpBB2&file=viewtopic&t=66943&postdays=0&postorder=asc&highlight=heads&start=...

Does anybody knows the size on the pipes, that is against the head?

Hope you understand my quistion

Does anybody know how many HP you can get with standard S4 heads?

Brand new stage 3 chip, from APR.

http://ecstuning.com/stage/edpd/pagebui ... uctID=7782

With the OEM cruisecontrol you can change between 4 program.

Standard program
92 oktan
95 oktan
98 oktan
104 oktan

600£