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compression is a major factor here. take the B18B (integra GS/LS, dohc notec)....it can handle a good 13psi max on STOCK internals (not daily, but @ the track)
now a B-series DOHC VTEC engine will need to have some internal work done to safely run over 8psi (for the most part - just at the track). so the DOHC VTEC motor will put down quite a bit more power if built to run with the turbo than a DOHC notec will......
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