While Traxxas may have beefed up the Revo 2.0 suspension arms, they're still not nearly as tough as RPM versions, nor are they as light. RPM A-arms weigh in 5 grams less than stock, per side, for a total weight loss of 10 grams!
Tech Notes: RPM #81462 & #81465 replace stock Traxxas #8631. RPM Revo 2.0 A-arms will not work with long travel (LT) style rockers. Upper A-arms will not work in the lower roll-center hinge pin hole.