Extractors, CAI, slightly lumpier cam to suit your driving preference and gearbox (Manual/Auto).. i prefer torque to flat out hp with a non high stall auto), exhaust and a matching tune would be my order of preference. Then if you need more power, i would start on high stalls, shift kits, head work (Port, Polish, Intake, Roller Rockers etc) as this is where the gains start costing MONEY!
Oh! re roller rockers and please feel free to correct me if i am wrong peeps, i'm trying to remember
Roller Rockers are so called because they have roller bearings in the pivot as opposed to plain bushes. They are stronger, allow higher revs (if other engine parts are equally updated), increased accuracy of valve opening closing etc etc
But you need roller heads don't you? I have a
vague idea you cant put roller rockers straight on to stock heads?
As i said, correct me if i am wrong, just throwing some thoughts into the ether
