The 1 7/8 inch super E features include adjustable volume accelerator pump that provides instant throttle response, variable position enrichment device for better starting and smoother warm-ups, two cable pull open pull closed throttle design that yields positive, safe throttle movement, short, stocklike overall installed length for rider comfort, and traditional S&S design teardrop air cleaner with 18.8 percent more filtering area for better air flow and performance. Call 1-800-366-3464 for price.