I had the Moroso aluminum ones on a previous car. I'm not sure they really do much though. As far as I know, I don't think a whole lot of racers use them. If you're concerned about U-joint strength, then the the better thing to do would be to switch to the larger 1350 U-joints and yokes(that's assuming that you don't already have them now) Ofcourse that would cost more than the girdles do, since it would require a driveshaft change or modification of your current driveshaft as well as a pinion yoke change and slipyoke change too. But it would also add more strength than simply using U-joint girdles.
But the larger 1350 series U-joints and yokes might not even be necessary in your combo if you aren't at a pretty decent power level. You can also get the solid type U-joints which don't have a zerk fitting for lubrication. it's often said the the weak point in the greaseable U-joints is the hole that's drilled in the body for the grease fitting. So some companies make the non-greaseable U-joints which do not have that grease fitting for more strength. BTW, if you don't have a driveshaft loop, then that would also be something that I would get if I were you before I would be concerned about U-joint girdles. What type opf car is this we're talking about (Chevelle?).???
