So what does your throttle body need?  More CFM, but not at the expense of velocity.    We analyze every throttle body to determine how CFM and be increased (larger throttle bores) and how velocity can also be increased (reshaping the port runners with space age epoxy).  

At Johnson Engine Technology we provide the best throttle body upgrades available. For all HD throttle bodies made from 2001 to Present. 

Throttle Body upgrades for 2006 to present bikes with throttle cables 

48mm High Velocity Upgrade
365.95

48mm Hi-Velocity Throttle Body (06-Present, EFI Cable operated) Features: 2mm Increase in throttle bore diameter to 48mm, Ported manifold runners, Epoxied manifold divider

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51mm High Velocity Upgrade
365.00

51mm Hi-Velocity Throttle Body (06-Present, EFI Cable operated) Features: 5mm Increase in throttle bore diameter to 51mm, Ported manifold runners, Epoxied manifold divider 

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