if you want more power
best bet to start off with list :

induction kit cta
ss exhaust
4.2.1 headers
cams
chip
ported, polished,gasflown,bigger valves and valve springs
de-cat
lighten flywheel/organic clutch lsd diff
cam pulleys
under pulley
supercharger
noz
turbo

rs body kit 2.0 tb bomz kit piper exhaust 3.5" megaleads ht 16" cossie rims Meg sticker ghia maplight/passager rear light ice under bonnet bling Auto wiper in reverse the first Mk1 windows on mod with ignition off