Hey all, I was wondering if anyone has any experience / measured the amplitude (loudness) of sound from a muffler that the rider experiences based on the cut of the end pipe / cap.

If it slashes down (top part of the tip is the longest), does sound hit the ground and bounce up to the rider? (around town of course)

If it slashes up (top part of the tip is the shortest), does sound come out of the top and hit the rider?

If it is a straight tip, does sound go straight out the back, and provide the least amount of sound the rider experiences?

Things that make me go hmmmm.......

 

Don\t know, but the turn downs sound louder than the straight cuts.

 

Have heard (no pun intended) that "Fishtails" definitely sound different then all the rest. but I'm sure you're correct that the end tip does alter the sound or at least the loudness level. I would think that turndowns are fairly quiet.

 

Only makes sense that turn downs will be loudest to the rider, followed by straight and turn up lowest. Reflection off the ground accounts for most of the sound a rider hears. Also slash down, straight, slash up.

 

Pretty funny. Just goes to show you...

I just put turn-downs on my 2-piece SE slipons and they're quite a bit quieter than the piston end-caps (pointed straight back). So much for the "bouncing off the road" theory. My 2 cents anyway.

 

That's what I've heard too. Pointing the tips to the ground deadens the sound for the rider and makes them quieter overall. I have the straight piston tips and am happy with them.

 

Length has a big effect on how much sound the rider hears. The farther back the tips are the less noise for the rider.
Judging from the bikes I've been around turn downs are a lot quieter.

 

Based on the length comment Rodeo, it also appears that your HD SE Touring Muffs are also longer than the MO's... would you agree? With the straight tips, that puts the sound outlet the furthest away from you when riding... or so it seems.

 

I think that turn down are probably quieter, but i hate riding behind guys with turndowns, as they really do help kick up dust/dirt.

 

I have noticed a difference in the sound volume depending if the tourpak is on or off.

The size of the opening as well as what type of baffle will affect the sound volume.