Hey 1xr - I have a 23 in it, yes. I ran the 10.998 with green springs with the stock airbox. The red springs from Holtzman work great with the K&N setup. The stock setup, allowed a little slower take off, compared to the K&N setup, which made it soo responsive, which made me spin a little more off the line. I like the setup, and can say they make it rev a little faster than the stock airbox with the green springs, which also made a big difference. I bought the kit from RX Warrior, and he said they really improved his sled a bunch, but sold them cause of his turbo setup. I guess I am leaving it up to you,bud, they are an expensive set up. But for those who have them, the red springs from holtzman is the way to go for the K&N setup. Wish I had better #'s for you. I wish I could have tried the stock airbox, with the nitrous, but had to make room for the bottle, and that is where I mounted it.
Thanks Matt - I will be tearing down this week, so you and Ryan, can expect me giving you a call sometime soon, to bring back the parts I used. Thanks guys!