Advanced Clutch Twin Disc XT Race Kit (T2R-D04) PPE_CeramicCoating_3 4240008-2 is a 4-pad rigid

4240008-2 is a 4-pad rigid race disc made with high quality

They get welded into your stock or aftermarket midpipe and bolt to the headers

Z66-HDG4 kit features ACT's most popular Heavy Duty pressure plate

The engagement is harsher

Advanced Clutch Twin Disc XT Race Kit (T2R-D04) PPE_CeramicCoating_3 4240008-2 is a 4-pad rigidT2R D04 race, twin disc kit offers twice the number of disc surfaces for better wear, heat capacity and long life compared to single disc kits. These kits use a proprietary Positive Lift Floater System design, which results in quiet operation with no floater rattle and no posts to wear. ACT twin disc kits undergo an exclusive four stage, heat treating process on all diaphragms. The ACT twin disc features the ability to adjust for disc wear and