Bonneville America Forums Forums Technical Forums Performance Mods Air box elimination kit and Thrux needles

Uni UP4229's are less expensive than the K&N's & flow better, too.

I suggest that you try both TBS & Thrux needles & see what works better for your combo; the TBS needles are similar in profile to the Thrux, but are a bit longer & will generally run a little leaner than the Thrux, all other things equal.