I am not an insurance agent, but the insurance on a 2.5i is different than a WRX is different from an STI and it is not just collision and comp I bet.
Turning a 170HP car into a 300HP rocket is not your average mod and unless you are also swapping all the safety equipment, they would probably be within their rights to void a policy.
All I am suggesting is that you investigate the situation before going forward.
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