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If limited to the choices above, I'd select the Ram HDX. Having the sintered metal face on one side improves durability somewhat. Also, I've used Ram products with success in many different applications. A lot depends on the power level and how much abuse you intend to inflict on the clutch. I've used discs with sintered metal material on both sides on the street for many years, I tend to be hard on clutches. They are a bit "on or off" and can cause chatter if the car is geared numerically lower than about 3.73:1. It does take more finesse to be smooth. I tolerate these things because I hate changing clutches. In my experience, the long style clutch is more reliable, shifts better, and is more consistent when shifting at high RPMs than a diaphragm style clutch. The diaphragm style clutch is not new technology but is very popular because they are fine for regular street driving and require less pedal effort to operate. I suggest you contact RAM tell them what you have and how you intend to use it and consider their recommendation. Good luck with the build.Chuck
If limited to the choices above, I'd select the Ram HDX. Having the sintered metal face on one side improves durability somewhat. Also, I've used Ram products with success in many different applications. A lot depends on the power level and how much abuse you intend to inflict on the clutch. I've used discs with sintered metal material on both sides on the street for many years, I tend to be hard on clutches. They are a bit "on or off" and can cause chatter if the car is geared numerically lower than about 3.73:1. It does take more finesse to be smooth. I tolerate these things because I hate changing clutches. In my experience, the long style clutch is more reliable, shifts better, and is more consistent when shifting at high RPMs than a diaphragm style clutch. The diaphragm style clutch is not new technology but is very popular because they are fine for regular street driving and require less pedal effort to operate. I suggest you contact RAM tell them what you have and how you intend to use it and consider their recommendation. Good luck with the build.
Chuck
