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Perhaps so but never the less they don't have the snap of the slightly older models in most cases . I'm of the opinion that most if not all newer models would benefit from some type of muffler alteration .I can't think of an easier way to gain essentually "free horsepower ". Some bellyache...

I can't remember the model of that demo I ran over at Twin Turbines GTG .What ever it was it zipped right through that close to 40" log .Never missed a beat .

:lol: Well that's the problem with some of us that have gotten used to more higher performance saws .What might impress some folks on a stock saw wouldn't be very pleasing to us .

Not really .Tom has a brand new one and it's pretty quiet .Ironically his 441 isn't too far behind it as far as speed of cut . As far as long exhaust, could be right with respect to sound level .The few I've raised from say 98-100 to 94-96 got louder but then again they got faster .

It's simple but complicated at the same time if that makes any sense . You are dealing with an engine that uses loop porting theory and as such as the rpm's increase so do the size and perhaps shapes of the ports .Bigger isn't neccessarily better if done to extremes . As the R's increase the...

Well like I said I think you are doing great ,it was just the figures or perhaps my misunderstanding of them that left me a little confused . As for an 066.MS 660 or whatever ,I've had them apart for repairs but have never done any alterations so I don't know the exact particulars about them...

First of all nice job .However as per the quote you said you cut 10 thou from the base and ground out about 10 from the perimeter of the combustion chamber if my interpretation of that statement is correct . If you cut the base 10 thou you effectively lowered the exhaust opening by that much...