I am a relatively new owner of the s40, have it for 6 months with about 500 miles, and live in Brookly, NY. I would like to upgrade my muffler for two reason, for the extra safety so I can be heard, and for the potential extra power. I've been looking around and reading a little bit in the forums. My question is, can someone direct me or give a suggestion on the best muffler. I don't want something that is not too loud in the low revs, but yet loud enough once I get on the gas; easy install, and if possible no re-jetting. I know I'm asking for a lot, and possibly not possible, but as a last resort, if I need to bring it into a shop to rejet, then that's what I'll do; just  trying to save a few bucks if possible.

Oh...and with the guidance of this forum opening up the air/mix screw as well as rejetting is easy.  If you have the patience and desire to learn, we'll help you.

Thx for the response, I did read that forum on the Dyna and and I'm in the process of contacting a fellow member in the NYC area. I believe he had the Jardine muffler, so we shall see. I would love ot be able to upgrade and understand my bike, but I'm not a big reader, more the hands on type, so videos and pictures are best for my learning style.

If you want loud then that Jardine fits the bill.

I have a Jardine. Once fully warmed up the surging at low throttle settings either goes away or gets so subtle way I don't feel it. It doesn't give me that throaty snarling spitting deceleration rumble the Supertrapp with 14disks did. The backfiring and fortyish MPG are inspiring me to hunt a Dyna.
If I don't dig the Dyna I guess I will look at something else.I sure did like that Supertrapp, but it's ugly and expensive.

Too bad we can't try mufflers on like shoes,,

Yeah, I got 49 with the Supertrapp.
I'm gonna be checking it closer, actually Write down the miles,,

Gary told it got around forty, I was filling up along the way, trying to remember the miles, but I can't, filled up today, took 1.3 but I forgot the miles, UHHgain.. I saw some fillups on the ride home that makes me think Gary is pretty right..
But I Do wanna pin it down before I make changes.

I have a mac performance muffler and in in Ny on Longisland, sound a bit quieter then Jardine