Body diameter 3.5”, tapers down to a 2.125” opening.

Add 3" discs to increase horsepower, exhaust tone and flow.

Remove 3" discs to reduce sound and increase low-end torque.

Internal Disc Series are available in a 1.75”(44.5mm) or 2.00”(50.8mm) inlet diameter.

P/N 328-1719 and 328-2019 include bracket, but do not include end caps. The end caps must be purchased separately. Both include 18 discs.

P/N 358-1719 includes a tapered end cap, but does not include bracket. Includes 12 discs.

P/N 358-1721 includes a slash cut end cap, but does not include bracket. Includes 12 discs.

3" Tunable Disc Accessories

How do you know which Universal Exhaust will fit your application? It’s easy! Click here and we’ll tell you how!

Videos of V-Twins with Internal Disc Series

Automotive Videos

Universal Videos

Mufflers sold with end caps do not have brackets.

Click any Model # for more details.