Well....I ran my XX-4 tonight for the first time and I must say I love it.
It was over geared with the 22 tooth pinion. I put a 18 on it and it was perfect. Made for some nice low end power thats for sure. I ran the XX-4 and the BK2 for the first time tonight and I thought for sure I'd come home with at least one broken buggy, but I was wrong.....thank god.