JayCee Billet Velocity Stack | EMPI HPMX & Weber IDF | 6061-T6 Aluminum JayCee's billet velocity stacks are CNC machined to fit EMPI HPMX and Weber IDF carburetors precisely, not as a loose adapter. The billet aluminum construction eliminates the cracking and warping common with plastic or OEM stacks. Available in Black, Red, and Silver anodized. Vehicle Fitment VW Beetle: All years VW Bus: All years VW Karmann Ghia: All years Carburetor compatibility: EMPI HPMX and Weber IDF Why Choose JayCee? This is a genuine JayCee product, CNC machined in Anaheim, CA, for a precise fit rather than a loose imported substitute. Key Features & Benefits Precision Fit: CNC machined for EMPI HPMX and Weber IDF. Billet Aluminum: 6061-T6 aircraft aluminum that will not crack or warp. Three Finishes: Hard-anodized in Black, Red, or Silver. Sold Each: Order quantity to match your carburetor count. Technical Specifications Material: 6061-T6 Aircraft Aluminum Finish: Hard Anodized Compatibility: EMPI HPMX, Weber IDF Sold As: Each Part Numbers: JC-4530-0, JC-4532-0, JC-4534-0 Frequently Asked Questions Which carburetors do these fit? They are precision CNC machined to fit EMPI HPMX and Weber IDF carburetors. Are they sold in pairs or singly? Sold each — order the quantity to match your carburetor count. What colors are available? Hard-anodized in Black, Red, or Silver. Material & ConstructionThis piece is machined from solid 6061-T6 billet aluminum stock rather than cast or stamped, which is why dual-carb and single-carb builders alike specify JayCee parts by name for Weber- and EMPI-based induction systems. The result is tighter tolerances at the carburetor interface and a part that seals and seats consistently, build after build.Installation NotesDry-fit against your specific carburetor body before final assembly, and torque fasteners evenly in a criss-cross pattern to avoid warping the sealing surface. Because this is a fuel-system component, use a fuel-safe thread sealant or o-ring where called for, and re-check for leaks after the first heat cycle. Explore Related Categories Dialing in your induction? Browse Fuel & Intake, Engine Parts, and All VW Air-Cooled.