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First, let's be aware of terminology. An "extractor exhaust" means the tubing that routes the exhaust gasses to the muffler. The distance the exhaust gas pulses have to travel is all the same length (heat exchanger distance is included). The ends of the tubing all meet at one spot and that's where the muffler attaches. An extractor helps to draw in more of the air/fuel mixture. I fail to see how it can induce a lean mixö\o” he vacuum extracts the exhaust more efficiently and thus pulls in a greater intake charge. Nonetheless, none of the current after-market muffler systems I'm aware of will reduce the life of an engine. I have never, ever, heard of an extractor exhaust. Freer-flowing (has less back-pressure), yes. The wrong muffler can restrict the exhaust flow, creating more back-pressure. Having several years experience with dual and single quiet packs on a stock and modified engine I know they won't cause burned valves. My personal preference is the dual system. Produces less noise and still allows equal or better exhaust flow. Toby Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed '95 VW Jetta III GL 2.0L, P-Chipped, Jamex sport suspension Portland, Oregon, http://www.pobox.com/~toby_erkson/ >-----Original Message----- >>> Not to mention the lovely tinkling and sparks you get from >>>your exhaust valves dropping all over the place! >>> >>Huh? What are you talking about? > >Exhaust has an effect on the overall tuning of the motor. >Lower back pressure and better extraction has the effect of >leaning out your air/fuel mix, and the motor runs hotter. The >hotter, leaner exhaust is "extracted" more efficiently, being >drawn past the exhaust valves at a greater velocity and there >is a risk of burning them... ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe