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the heavy duty torsional dampening springs are stronger
MS1-HDG4 kit features ACT's most popular Heavy Duty pressure plate
FM5-SPR6 kit features a Sport pressure plate for a nice upgrade
Testing on a 2006 350Z showed an increase in top end power and midrange torque over shorty headers and testpipes
1 5/8" runners with a long formed collector and 2
Advanced Clutch HD/Race Rigid 4 Pad Kit (Z64-HDR4) PPE_CeramicCoating_3 the heavy duty torsional dampeningZ64 HDR4 kit features ACT's most popular Heavy Duty pressure plate. ACT Heavy Duty pressure plates use exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All diaphragms endure a four stage, heat treating process for unparalleled performance. ACT pressure plates have precision cover stampings to provide rigidity and consistency. ACT's 4 pad rigid race discs are made with high quality, ceramic friction
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