Big gun REV box?

[matt581yfz450]

Do the big gun REV boxes make a differnce? Thanks

[oglejust]

im kinda wantin 2 get a 4 sure answer as well... ive heard it only helps top speed but i cant really find a for sure answer. it gives 1000 extra rpms i no that

[matt581yfz450]

i know if it doesent make that big off a differnce not gunna spend the extra $ lol