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Originally Posted by Average Joe
Great advice here!
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The VW guys that are pretty sharp have been preaching that info for years because its essential on a hopped up VW. They're aircooled so it's easier up combat heat by not making it in the chamber than it is to shed it with added cooling efforts, so lean cruise mixtures are important. Plus the mileage/power difference is more noticeable when the jetting is off in a VW so more guys are into tuning. You've only making 50-60 hp stock and 200-220 on an all-out street motor- the tune has to be right to get the full potential. V8 guys have enough power already that losing power from a poor tune isn't as big of a deal.