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-----Original Message----- From: Ji——\Í<jadney@vwtype3.org> To: type3@vwtype3.org <type3@vwtype3.org> Date: Saturday, January 30, 1999 6:13 PM Subject: Re: [T3] What that noise? Backfiring on over run means that the carbs are running too lean, at least at that moment. It is also well known that the better breathing promoted by a better exhaust will require you to jet your car slightly richer. So all the evidence is consistent. Jim ============================================= hey Jim, care to elaborate on that. how do you do it? specialty drill bits? little files? do you have a measurement in mind based on engine displacement or just experiment till the plugs look right? i have been trying to get this question answered for about three weeks now. i know my engine's running lean, but i don't want to destroy anything. thanks, Brandon 73 square ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/