Depends on your back angle of the CV's at full droop. Ideally, you want no back angle when the suspension is at full droop to help gain down travel and keep CV angles respectable. If the trans/engine are in factory spots, you may run into CV bind sooner than on the 3x3 arms because you have more back angle. I would certainly do it if you are the fence about it. you will gain more from it and keep CV's happier. I know there are guys who have put 5x5 on cars with the engine/trans in the factory spot, gained travel and say CV's are happy but ive never seen them give the full story as too how much cv angle they have/had, dont know how to measure the back angle, swapped to micro stubs from type 1 (you gain travel from that alone), and other things. Mine was already moved back parallel to the hubs when i bought the car. it was actually too far back, cups were in line with each other at ride height but the hub was farther forward at full droop. with the 5x5 arms, i now have only 1* of back angle (hub is now behind the trans cup) when at full droop.Quick Buggy question. If you put 5x5 arms on the rear do you need to move the motor/Tranny back more? We have 3x3's on the back of the manx and I was thinking of going bigger but wondered if we had to move the drivetrain at all.