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In Australia, the HP came standard with the Turbo+ kit.
740 Turbo = 115kW, 253nm
740 Turbo HP = 134kW, 260nm and flatter power/torque curves.
I personally test-drove both an '87 Turbo and an '89 Turbo HP, and the difference was actually extremely noticable. Bought the HP and have never looked back. :-)
To make a regular Turbo give out the same power, simply adding Turbo+ (if you can find one, or just increasing the boost a few PSI) *should* do the trick.
PS- Not sure if the difference is the same in the US.
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