Ok fellas, just got a xxc1000 and I have pretty much spent all my free time this week riding it. I hit the desert today with my buddy on his 700xx and we had a great time. We came across a group of guys – one of them was on a KTM 525 and the other 2 were on newer yfz450s. We got to talking and they were real cool guys so naturally, we lined them up on a harder packed section of sand and let em rip. Sadly, the big gade finished dead last in nearly every race with the 700xx and KTM "topping the podium" so to speak. When speeds got over 65, I was able to eventually start to reel the 450s in but the other 2 were still pulling strong.

Now, the 700xx has a full FMF exhaust and a FMF fuel programmer and the other 3 sport quads were had stock motors with pipes as well so I’m sure that had a little bit to do with it, so my question is this

What exhaust will give me the largest power gain? I see HMF makes an exhaust but I’ve never really been a fan, any other reliable options out there?
Does anyone here have experience racing some of the higher powered sport quads? What’s needed to slap some respect into them?