The difference is in the rebound valving
and offers a very high load carrying capacity that has greatly increased dynamic wear characteristics
Requires Aftermarket Camber Plates
A true bolt in 4 point design perfect for trackdays and time trial events
And while this design is unique to the EM sized spring
1-3/4" Stainless Headers. 2005-2013 Corvette 6.0L/6.2L. 2024 ford mustang The difference is in theKooks Headers and Exhaust has been the leader in the High Performance Exhaust Industry for over 50 Years! Since 1962, Kooks takes pride in offering the best Headers and complete exhaust systems for your street, race and off road applications. We have won hundreds of championships and set countless records in the NHRA, IHRA, NMCA, NMRA, NASCAR, NASA, SCCA and many other racing organizations. Now with three generations of family leadership, we are proud