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Let's see your fill-up and MPG logs for that Pinto.
I got 500-bhp once from my pre-gen Ninja by running it with mix of cough-syrup and rubbing-alcohol. My neighbor only got 400-bhp from his with molasses and rum because mixture was too thick to fully vapourise.
Back-pressure is out-dated idea as exhaust-pressure is not constant. Modern knowledge and current tuning idea is called pulse-tuning. At certain times, there's pressure in exhaust, other times, there's vacuum. You want to time things so vacuum pulls exhaust out of cylinder just as exhaust valve opens.
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