Originally posted by Vocky here it is slightly abridged
this is a basic guide to what you need to do to your z22se to reach the power stated and to stay 'normally aspirated'
bhp figures are based on an average rolling road's fly figure
step one: 160bhp
remove precat, fit panel filter and cat back performance exhaust
step two: 170 bhp
cams and a ported throttle body
step three: 180 bhp
ported big valve head and a 4-2-1 exhaust manifold
step four: 190 bhp
2.4 inlet manifold, 68mm throttle body and matching inlet pipework, remap
step five: 200bhp+
a 'TxV spec' engine (Tweaked by Vocky )
or
throttle bodies and stand alone ecu
step 1 filter @ £45 and exhaust @ £275
step 2 'piper' cams £235 (exchange) and ported throttle body @ £250
step 3 big valve ported head @ £1000 and 4-2-1 manifold £200-500
step 4 2.4 inlet manifold @ £185, throttle body @ £100 and remap @ £250
step 5 throttle bodies + ecu @ £2100