$350-400 installed and tuned is a really good deal, check that price again, plus you'll get a dyno chart. But..........if you buy a zt-2 datalogger for $279 and buy a used safc you'll end up spending a more but you'll save in the long run because you won't have to pay a shop to retune as you keep upgrading your car. It's your call. You bring the beer and hotwings and I'll install it for you.