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Either of the 2 are going to be pretty quiet. I know walking by either of the 2 it is hard to hear them compaired to my LB7. As far as having problems changing the 5 speed to a six....I haven't heard of any problems and it is pretty easy. I wouldn't however install it on a truck that has a programmer and stock tranny. It isn't recommended used with power adders unless you have one of the tranny beef-up kits like the one from suncoast.