had always wanted to upgrade to this but was always to lazy till i was running a stock car on a smooth long driveway and went through 3 stock ones. that's when i knew i had to get them. i never thought they would do anything more than add strength but was i wrong with these new ones they can now let my car keep going after letting off of the gas and they let my motor run 20 degrees F cooler while also improving my suspension performance. buy it now once you do you'll buy a couple sets if you have more than one car.
Needed when putting a hotter motor in the Xmod, as the stock cups will bend open under the increased RPM. Although the cups didn't open, the dogbone pins had pitted the cups from a high powered brushless system, but it held up which is something the stock shafts had no chance of doing.