If u don't know what you're doing run it on digi, and if luck is behind u it might work with no problems. However it prob wont and you'll be on here everyday asking for help. If your kr runs fine then just swap the lump..job done. Unless you want to change loom and fuel system etc as well as the engine then go for it with digi. I've had an abf on Kjet and I'd recommend it to anyone. I used to smoke people up on a daily basis. I've got bored of 159bhp and gone 20vt since, and I see some folk are still struggling to get their digi running right, they never get to enjoy it!! Mines been in and out in that time. Yeah on paper digi is far superior, in practical terms however its over engineering, and a lot more hassle for little or no gain. You'll have a smoother more efficient mk2, but you'll prob get done by Kjet abf's (if your digi ever leaves the garage that is). I speak from experience as I've had one myself, am an electrician, and am constantly getting asked to look at a mates poor performing digi abf.