VF30 came off early Bug STi
VF35 came off Blob STi
They are pretty similar turbo's
The above can achieve upto 340-350BHP, but normally sit around 320-330BHP. Good spool times
VF34 was on JDM and is a roller bearing equivalent of the above. Better Spool and a touch more power 360BHP would be considered good going. This is considered the best of the VF range, but can be pricey.
VF43 is off a Hawkeye STi and will run more power then the above, upto about 370-380BHP
TD05 was never officially available as a front entry turbo for 97> Subaru's. These are all modified and/or aftermarket builds.
These come in various sizes 16G (350BHP), 18G (380BHP), 20G (400BHP)
Spool on these is slower then all of the above, but this can be assisted if fitted with a billet wheel
All of the above would be a direct fit, but the VF35 has probably been recommended for you as it's the easy choice STi retrofit.
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