HKS 4-2-1 Exhaust Manifold- S2000
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This new HKS manifold does not sacrifice the torque characteristics at low to mid engine speed range. The layout is the same as the factory 4-2-1 type manifold. HKS's manifold is twisted at "2" to extend the pipe length, allowing the torque improvement at mid engine speed range. This results in a reduction in knock limitations allowing extra tuning to the AFR's and ignition settings (when using an aftermarket engine management control system).