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<x-charset iso-8859-1>JimA=> The properly designed OE mufflers, OK, to what rpm do you think the stock muffler will flow? We don't have enough experimental data to be sure what's causing it, but I have a cam designed to top out at about 5500, and I'm running out of torque at about 4200. Two excellent mechanics and I agree it's probably the exhaust, which is a modified stock muffler on stock heat exchangers. That's why I'm looking at alternatives. Steven Ayres, Prescott AZ '66 KG1641 ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/ </x-charset>