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My comments below. 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/ P.S. It's obvious I'm on the list so there is no need to send me (or anyone else on the list) duplicate mailings! Thank yoooou. >-----Original Message----- >>An extractor helps to draw in more of the air/fuel mixture. I >>fail to see >>how it can induce a lean mixture. The vacuum extracts the exhaust more >>efficiently and thus pulls in a greater intake charge. >When you improve the flow characteristics of a motor, you are >potentially moving beyond what the carb/s is /are jetted to >deliver. If you're jetted to deliver a correct fuel curve for >a basically stock motor and suddenly you are delivering more >air through the carbs by reducing or eliminating back >pressure, you might need to bump up main jet size(s) to >compensate or you'll run lean at speed. Leaner is hotter in >an air cooled motor, and can cause Bad Things to happen. Okay, I believe you. I know leaner is bad news - I've burned a valve before :( >>My personal preference is the dual system. Produces less >>noise and still allows equal or better exhaust flow. >But compared to what, and equal to what? You are running a 2 >liter monster, the dude was asking about a 1600. Before I could afford my 2.0L, before I could afford my 1641cc, it was a stock FI 1.6L. And she ran with dual and single mufflers. By my parents and later by me. There's my experience. In college I learned to compare apples to apples and my orange definitely wouldn't compare toS#le ;) ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/