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exedy is the most commonly used twin disc clutch here...I've driven one and liked the way it felt
There is no actual way you can make a statement like that without having numbers to back it up. Exedy is a sponsor of AMS and if you know how Retail works with AMS's reputation it is smart of Exedy to have AMS push for their products. I am not saying that Exedy is a bad clutch because it's not.. It's an awesome clutch and it's very well proven to work.. But I believe from my own experience with both clutches that Quartermaster Twin's are equal in performance and superior in drivability.
Remember Mike Raichen who has an Evo 2, he broke a world record in the Texas Standing mile with this clucth.
And Adam from Devo Tuning ran a 8 second pass in his Evo 2 also with this clutch. There are many other people running these clutches who are very happy with the product.
I am not supporting either product but if you ask a question I want to give you all the information I know from my own experience.