I read about the adjustment that needs to be made to rear beam when the max is lowered. However, none of the threads addressed when the QT Adjustable Link is actually needed. Meaning is it only needed when you lower your car, say 2" or more? I'm going to lower my 5.5 gen max with Tein H Tech springs. Those springs have a conservative drop. Do I still need to get the QT Adjustable Link with the Tein H Tech Springs?

 

I don't think there's a specific number of sorts. It's just going to depend on your setup. For example, I'm dropped roughly 1" on Eibachs. If I run a stock offset, I have no rubbing. If I run my 350z rims, then I do experience slight rubbing on the passengers side over hard dips/bumps.

But, yes....the lower you go the more the beam will shift to the passenger side. I believe it's a good idea you are considering it.