The mystery Header is Kooks new "Signature Series" Header. They had these at PRI, and we have been holding off anouncing till we did a dyno test. This header is 1 3/4" stepped to 1 7/8" and comes with an extra O2 bung from the factory for wideband tuning. It will cost $200-$300 more than standard 1 7/8" because it requires a bunch of extra work to make, but the gains are there. For more details call us @ 443-730-9428.
Just so you can see them side by side, here are the 3 runs with the Kooks 1 7/8"
