unless you want to tie wrap a second header to the hood i would stick to just one. =P

you can get a better intake manifold

lose the mugen chip ecu and dont get a spoon, get a stock and have someone chip it, there are people here at han that can help you there

look into block work

you can always go turbo or supercharge it (go turbo)

nitrous is an option but nahhh

you can go skunk 2 cams, crower etc...look into redline options and VT with that

Limited Slip Differential

Tune that sucker