Im saying in this instance its cheaper as it ALREADY done!

Depends which cams you go for doesnt it,i know shawpseed SS4's are recommended and there DOUBLE what you quoted.They need exhaust and remaps as stated,decent exhaust is 600 and remap is again another 4-500 (full omex is recommended andding another 5-600)

My puma cost £350 (at mates rates) bought and fitted!!

The OP has stated he doesnt want to spend alot,for track action a standard car with brakes and suspension will be great fun

But for the same money why not have the extra 23bhp mine has