4" Chrome Velocity Stacks, Pair -EMPI-has-these-systems-available-in-1-1/2"-&-1-5/8"-diameters-for-whichever-performance-level-you-require

-EMPI-has-these-systems-available-in-1-1/2"-&-1-5/8"-diameters-for-whichever-performance-level-you-require

-Select-the-appropriate-cam-for-your-application-and-install-using-new-Cam-Lifters

-After-polishing-they-are-anodized-and-the-JayCee-logo-lasered-in

-This-includes-1/4"

-The-thread-for-the-mirror-is-M10-x-1

4" Chrome Velocity Stacks, Pair -EMPI-has-these-systems-available-in-1-1/2"-&-1-5/8"-diameters-for-whichever-performance-level-you-requireThese Chrome Stacks or Air Horns aid in prevention of fuel stand off and look great. Fits all EMPI HPMX, IDF WEBER and DRLA Dellorto carbs. All Stacks are Steel with Chrome finish. (SKU: 4360540)