Pro Circuit 4 X 1.5 Canister Quiet Insert PC4012-0007 838485015635 The old standard shims will

The old standard shims will not hold up to the extreme spring pressures and high RPM in today's race engines

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Pro Circuit 4 X 1.5 Canister Quiet Insert PC4012-0007 838485015635 The old standard shims willBrand Pro Circuit Model TRTD5311 Color Silver Size 1 1 2" 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 4in. canister and 3. 5in. canister. Call for applications Note: 2007 2008 Stainless Inserts will NOT fit older model end caps Pro Circuit Stainless Steel Quiet Inserts Are Available in Multiple Sizes to Make Your Motorcycle Quieter,