Adjustable vs. Non-Adjustable LRCA

Using adjustable control arms is really for setting your pinion angle. On a street car, I'd just grab some non-adjustable lowers, and if you want to adjust pinion angle, grab some adjustable uppers down the road.

It all depends on how big of a slick you want to run under the car. I would call someone like MM and see how big of a slick you can run with standard LCAs and if you want bigger than that then you will need to get adjustable LCAs. The adjustable LCAs don't really do anything for the pinion angle they are generally used to gain clearance for taller tires. As stated by others the adjustable UCAs are where you can make your pinion angle adjustments.