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Welcome. The 20B is not a cheap swap as you'll find posted all over the place here (specially developed parts and supporting hardware mostly). If you really want to do this you'll need some pretty good backing. A 13BT would be cheaper and developed parts easier to come by. It can develop comparable horsepower when done right, the main advantage for the 20B is that it develops better low end torque and may not require as much boost for the horsepower level. It ain't cheap though.
The Opel GT sounds pretty cool, but what is the rationale for picking this platform? Class rules?
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