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Assaf=> every time that I'm sliding downhill, I've got backfire. I agree, this is caused by a leaky exhaust. => Do the rear heat exchengher/muffler seal are only type 3 item? Yes, but it's not difficult to find. It's a simple copper crush ring. I expect that tÍdF‹ausing your popping problem. => How bad it is for the engine? Not life-threatening. It puts some additional stress on the exhaust system -- these are small explosions, after all -- but I don't believe it can damage the heads. Easy to fix, in any case. Steven Ayres, Prescott AZ '66 343 ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/