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Hello, I own a bug eye wrx with sti transmission and I am planning to install a Gtx3076 1st gen turbocharger and install forged internals with a target up to 470-480 hp to the crank. Can stock sti exhaust headers, slightly ported, handle that setup? I know that aftermarket 4-1 uel headers have better flow but the stock ones have better sound so if I could keep them it would be ideal for me.

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Yes, you can run your stock sti headers, but you would be better off putting aftermarket headers on it that ways your engine will have better flow. The stock headers will be very restrictive with that much horsepower, so it is more idle to get after market headers.
 
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