You may want to measure the thickness on the cylinder head casting. 3.750" is stock.
Anything less than that, and your going to have to run a shorter, fixed length, or an adjustable.
S&S is the flavor we prefer. 
Scott
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"If a street Harley doesn't have torque, how much horsepower it makes, simply does not matter."
"Treat your dogs with respect, keep your traps oiled and checked, and Beechnut is the tabacco to chew." The Renn, date unknown.
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