Which one is the best BP 5' vs 6' for UDM?

[tommy]

I already have bp 5' its come with UDM and i've ccs 6.5' also. They are work ok but i'm thinking of to order backup the pb.

i just wondering about the result or improvement between using bp 5' and 6' with ccs 6.5' pad?

[ZoranC]

Hint: UDM is optimized for 5" bp that comes with it. 6" bp will result in increased vibrations. IIRC they recommend against using 6" bp with it due to that reason.