First, the viva is NOT meant to be ridden shorter, in fact, im not convinced any board is (except maybe boards like the LF fish). Yes, the Viva is a much faster board than the Mana, i loved the Mana just not the speed, it felt like i was riding through silly putty. I would say you should be riding a board no shorter than a 140, but it's really up to you. The viva 140 will not have any noticeable differences in length from your 138, but I'd personally check out the 144. Im the same weight, 5'9 and moving up to a 143 was the best choice ive ever made. Just a thought.
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