Not to sound right or anything but cheaper te better! As I'm looking to get my exhaust and get my eg mapped this month or next so on a tight budget I'll take cut/uncut ported/unported
Best of all three is the RSP then RRC and RBC
Its a little bit more money for the one's that perform better
Yes RSP is from FN2..
But if you can get your hands on a ported RBC ( real port..not just port match throttle body opening ) it would be better than any stock manifold..