I sent an email to one of the top motor engineering firms in SA and asked them for some quotes on a stage one and 2.
I then asked them if they would be able to source and fit throttle bodies to the car. This is their reply
hi robin.
the following I can offer you:
-programmable computer "chip" at R2650-00 (200 quid)
-s/steel free-flow exhaust system at R1500-00 (115 quid)
-performance air filter at R550-00 (42)
-gas-flowed cylinderhead with modified cam at R7000-00
about the throttle-body I cant give you much , sorry. we would be able to flow yours but it wont give you 40kw. , maybe 10kw.
for more info please phone me.
I get the distinct feeling they have no idea what they are talking about.