Billet construction Made in the U.S.A. Compatible Vehicles Years Make Make Notes 1995-1997 Harley-Davidson Bad Boy FXSTSB 1990-1999 Harley-Davidson Fat Boy...

Base gaskets feature S&S Pro-Formance micropore compound proven to resist failure due to extrusion or blow out 4.125" bore size with stock bolt pattern 0.46mm thickness Made in the U.S.A...

Reduces a 1/2"-13 threaded hole to 5/16"-18 Sold each; two required per motor Made in the U.S.A.

Base gaskets feature S&S Pro-Formance micropore compound proven to resist failure due to extrusion or blow out 3.50" bore size with stock bolt pattern 0.46mm thickness Made in the U.S.A...

1.375" insert is 2dB quieter than supplied insert on most applications Power and torque tunine Tone and sound adjustment Ease of installing 304 Stainless construction

Base gaskets feature S&S Pro-Formance micropore compound proven to resist failure due to extrusion or blow out 3.625" bore size with stock bolt pattern 0.55mm thickness Made in the U.S.A...

1.5" insert is standard in most Power Tune XTO applications Power and torque tuning Tone and sound adjustment Ease of installing 304 Stainless construction

Canister is slightly smaller in diameter than stock filters to make them easier to remove and install Designed with a direct bypass valve that routes bypass oil directly to the filter exit, which...

1.625" insert is 2dB louder than supplied insert on most applications Power and torque tuning Tone and sound adjustment Ease of installing 304 Stainless construction

Base gaskets feature S&S Pro-Formance micropore compound proven to resist failure due to extrusion or blow out 3.500" bore size with stock bolt pattern 0.51mm thickness Made in the U.S.A...

1.75" insert is 4dB louder than supplied insert on most applications Power and torque tuning Tone and sound adjustment Ease of installing 304 Stainless construction