4to1 2.5in 3.5out light

The ultimate part for making exhaust manifolds for maximum performance. Featuring smooth transitions, and exact dimensions for the best flow possible. This translates into less back pressure, and means more power with the same boost, or the same power with lower boost (and less lag)!

To decrease weight the slipovers have been deleted entirely from the design. Instead we provide the collector with a laser cut center piece that has to be welded in the center of the 4 primary tubes. Once the primaries and the welded piece are nice and flush they can be welded all around the collector, creating a 100% air tight seal.

Recommended for drag racing/other intermittent use only! Because of the thinner design to reduce weight and because the primaries are no longer welded individually to the collector, the merge spike is not cooled as effectively as on our regular design. We therefore don't recommend this collector for continuous use at very high temperatures, such as circuit racing etc.

Made from 304 stainless steel.