The 2100 is better on power and economy, so I've heard. They are really easy to work on. I just bought a CJ7 with a 2100 and the previous owner didn't tune it correctly, so I'm stewing over what to do with it. :x I just can't get it configured correctly. Oh yeah, the 1.08 is the best for a 258. Maybe you can have some more luck. :?|