GM /SAAB / Holden / Fiat /Buik / Cadilac V6 manifolds (HFV6) The new manifolds were designed for a few die hard GM developed HFV6 lovers that have been trying to find a solution for the very restrictive Factory 3 into 1 design. After a lots of testing and back and forth development in American and Australia we can finally release our new manifolds which come as a ÒtunerÕ kit. This means they require fabrication to be usable. We are working with further more complete option to be released later this year. Our new manifolds flow 130% greater than the stock units. They are supplied with outlet flanges to match up to 2Ó tube and our high strength cast clamps sets. Key Features: 130% greater flow than stock EGR provision. Compact design to allow fitment on most applications/ variations of the HFV6 family. Supplied with outlet flanges and clamps.