Yeah,what he said.
We actually designed the grand daddy of this new bar specifically for our 3 link car which we were running with a lower than stock rear roll center. We needed more bar rate than we could get out of an OE style bar without binding up the rear suspension. That cars now runs and watts and the same adj. rear bar. Our Stage 2 car has been running the C4L rear suspension with the watts and adj. bar for a few thousand miles now. The adjustability in both systems allowed us to dial the car is just how we wanted it (and of course we`re happy to pass those tips along to our clients so there`s no guesswork) and the car is just so planted, predictable and linear that you`d swear we much have replaced the whole rear suspension. Now you can drive the car 10/10ths (or even 11/10ths!) and it just will not bite you a stark contrast to the rear suspensions normal twitchy schitzo behavior. The watts and PT bar are made to work together on stock axles. Guys with wide center (circle track) 9" rears will have to run different axle clamps for the watts (just ask when you order) and grind the inner side of the PT bar`s saddle brackets. All in all maybe an extra 1/2 hour for the install. Mark SC&C