Chrome plated steel with 3 1/2" OD with internal disc. Incl. Tapered end caps. The stainless diffuser discs pack of 3" diameter, allow backpressure tuning. Provides up to 10-15% horsepower gain. Used with OEM round FXST style mounting bracket. Note: Stock heat shields must be re-used. 

1997-2002 Softail