The Megasquirt will give you much more room to grow without having to get your chip redone every time. The support community for tuning is great with quite a few members here as well as other sites. MSefi is a good one. You have potential to make big power, which IS doable on an A9 computer, I've seen 850+, but why not open up your potential for more. I'm currently running a PIMP system which is MS based. Sadly, I haven't had the time to put into the tune as I'm having other issues now. I love the ability to manipulate everything. I have more I/O's than I need, and learning about tuning is amazing. Hoping to get the gremlins worked out and get this thing running strong. Hopefully my Dart motor will be ready for transplant soon!