They are listed as 4 inch in diameter. The stock slip ons are 3 inch.

 

after i posted the question of "length" it occured to me that you mean diameter. so you like the sound? i may go with those pipes.

david
socal

 

I got these same mufflers as oldmsocko based on his description which was right on. SE Street Performance Touring Mufflers 80732-09. Sound is a low rumble, but when you blip the throttle, there is a nice growl...I don't need loud. These are just right, and the neighbors don't mind them at all. I can still hear the radio through the speakers, but I have to raise the volume.
Harley also offers SE Street Performance slip-on mufflers - one piece 80721-09, slash down, that are more aggressive sound and performance wise, comparable to SE II race-use mufflers. Street legal on stock engines.

09 TG
Pasadena,CA

 

I have the black ceramic coated version of these on my Triglide. Just a touch more rumble but not loud at all. Actually mine seems quieter than my dads, I think its the catalytic converter muffling it more.

 

the black ones are the ones i am looking at getting. i hope i get some nice results with the AC and the download. i just do not have the tq when i twist the throttle on this trike as i have had on past bikes.

will put the stage 1 on next month.

david
socal

 

Why not do them both at once and save money on the Map/Tune? Will you have to reMAP when you do the Stage I AC? Just wondering

 

when i say stage 1 i mean, AC, pipes and the download. i do plan on doing all three at the same time, probably second week in october.

david
socal

 

Your going to get a little someting from it, don't expect a bunch. Its tough to compair bikes to trikes, big weight difference. My 06 Ultra is and animal compaired to my 2010 Triglide. When I go from one to the other the difference in power is huge, but then the 06 isn't stock and it weighs 800 pounds vs the stock engine in the trike and its 1200 pounds.