Get out of the corner fast and maximize your pulling power on the straights! Designed for all out Race Competition, Drivers Education, PCA club racing, track events, and off-road use. Fabspeed Motorsport 987.2 DFI Porsche long tube headers with Formula 1/ Indy car style high velocity spiked merge collectors provide maximum exhaust flow from the engine cylinder heads straight into equal length primary header tubes and a INDY Car F1 merge collector The Fabspeed Motorsport race competition Porsche 987.2 headers are the Worlds Very Finest Race Competition headers Dyno developed and independently Dyno proven by Porsche Engine builders and Racers world wide. In back to Back independent Dyno testing Fabspeed racing headers outperform “Blow Away” the competition. Caveat Emptor. Fabspeed headers are chosen for 3.8liter to 4.0 liter custom build engines too.