1 1/8" 3.5" Flat Base
Stainless Insert Description:
The Pro Circuit Stainless Insert is available in multiple sizes to make your motorcycle quieter, without the loss of power. These inserts are available for both the 4" canister and 3.5" canister. Call for applications.
Note: 2007/2008 Stainless Inserts will NOT fit older model end-caps.