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On Tue, 2002-02-12 at 13:03, Steven Ayres wrote: > 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. > The orginal engine was not designed to turn much over 4500 rpm.That is where the exhaust is probably limited. Also, if you are running out of rpm, you might look at the intake side of the engine also.That is quite restrictive, in stock form. -- Russ Wolfe '66 FB MT (It drove) '71 FB AT russw@classicvw.org http://www.classicvw.org ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/