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S&s mk 45 slip on mufflers

5K views 9 replies 4 participants last post by  Road dawg 
#1 ·
So I got some new S&S mk 45 mufflers for my milwaukee 8 stage 2. For some reason it lost some low end torque from what the screaming eagle slip on dynoed at. both are 4.5 inch mufflers. does anyone know if puting in the optional decible killer baffles might help it get more torque?
 
#2 · (Edited)
Anytime you run a baffle its conducive to building more torque than no baffle, i ran rineharts 4 inch on my glide till i switched over to the MGS slip ons, lost a little torque but very little because the MGS baffle is one third of the rineharts but they do also put in a torque cone in the MGS . Secondly a louvered baffle builds better torque than a perforated baffle, slows the rate of gas flowing out of the muffler to build better lower end, hope this helps.
 
#3 ·
Thanks road dog! ya, the s&s have perforated baffles. they sound awesome on my milwaukee 8 with stage 2. they do have A decible reducing baffle that is easy to put in. i was wondering if they would bring my low end torque back without affecting my dynotune.
 
#9 ·
Did you dyno the bike back to back on the same day? That's the only way you'll get a 100% comparative Dyno out of the new pipes power output. If not, weather can play havoc with Dyno numbers, heat and humidity, if you motor was heat soaked....etc...etc... Throwing in the more restrictive baffles will prob yield you a few more lbs of torque tho you HP could drop at mid/higher rpms from the more restrictive exhaust. Don't go chasing Dyno numbers...you'll only end up with a race built motor that doesn't like stop and go riding! Ask me how I know hahaha!
 
#10 ·
Correct, for that minutes amount of torque or hp it will not be felt in the seat of the pants dyno,but the decibal killer baffles might be restrictive, try em both ways and see what you like better,easy enough to do, good luck
 
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