- if EFI, then custom plenum
- if webber, so many different webber setups its not worth mentioning everything
- aftermarket ecu if EFI'd
- extractors
- bore and stroke
- different cams
- 2T/3T hybrid (most common)
- supercharge it
- turbo it
the amount of possibilities can be endless. the question you should really ask is this;
'i have $xxxxxxx what can i do with that on a 2TG?'
that way we can give you a more realistic breakdown and value for money mods.