here is the reason to go with a 7" bag. at 85 psi i am topped out. i can ride at 65 psi in my front bags. with a 6, you will probably need about 120 r more topped out. with a 7 you get more lift with less pressure, its worth it
I love my slams but i have the rs62's on my front it rides smoother than any other vehicle i have ever rode in, on air. I also have the v6 not the 4 cylinder so that adds to weight.