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Without this modification the exhaust vanos will retard cam timing causing a huge loss of power by 250hp and it is proven to do so
AN Fittings
E-Brake must be deleted with this kit
This causes the starting IATs on subsequent runs to be higher than on the initial run
RK Autowerks Billet 4 Pin Crank Hub N54 N55 S55 f3xexhaust Without this modification the exhaustDESCRIPTION 4 pin design to ensure the hub wont spin, even with heavily modified S55s Laser scanned to ensure perfect fitment direct replacement for stock Designed and machined in house with our CNC mills Machined from heat treated 4130 Chromoly Machined by RK Autowerks Compatible with all S55 M models, N54, and N55 we do not recommend the splined crank hub nor will we install them for liability purposes. this crank hub is 100% guaranteed
