I installed the M 4 Retro Drag slip on's on my 2013 14 R.

I really like the way they look and am happy with the sound.

I've been told by others riding with me that they aren't "too" loud.

Anyway, I couldn't find an audio clip on the site so I figured I'd post one up.

The bike is initially at fast, cold idle. At about 30 seconds into the clip it revs down to warm idle. I revved it to about 3000 rpm.

Hope this helps anyone considering buying the M 4 pipe.

M4 Retro Drag Slip On

Mike

beautiful bike. Sounds good too!

Sure is nice to hear a 14 run. I haven't heard that in a while.

I always say, if you're going with slip-ons, M4s are the best choice for looks, weight and sound.