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Shaun,
Thanks for the mroe concise explaination. To check my understanding, the sound is due to not totally combusted fuel/air mixture from the cyclinders entering the exhaust during closed throttle.
Since you mentioned vacuum gauges. I've seen them on some cars, think it's made my Defi. Looks really cool but what is the point of monitoring the vacuum pressure, even on the track? What about exhaust temperature?
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