If you have already purchased a Skunk2 Ultra Race or Ultra Street manifold, you can send it to the address below to be CNC Ported.
4 Piston Racing CNC Ported runners flow 50-70 CFM more air than an off the shelf manifold depending on the port profile. These ports are designed to be port matched to our race winning CNC ported cylinder heads.
Please included your contact info and what engine you have in the box with the runners. Ship the manifold runners to:
4 Piston Racing
200 Colin Ct.
Danville, IN 46122
317-440-6777