Hi Guys/Girls

just looking for general help.
i currently ride motocross but have just brought a mountain bike for some extra cardio but have found i really enjoy riding xc.
the bike i have brought is a kona kikapu delux with lots of upgrades but only has a fox rp2 rear shock.
i have been told that the rp23 will fit straight on but am not sure or lengths??
any help would be muchly appreciated as i would like more travel on the rear.

thanks in advance