I'm remarking about your 'costly' statement, a reflash from me for these types of kits costs $600 base, thats it nothing else is needed, it'll be safer and have as much power as the standalone stuff, and it'll pass sniffer and OBD II, you need an efi standalone, a harness, and tuning, which is considerably more, yes you can retune to your hearts content and if thats your goal you ought to install a standalone, but it'll cost a lot more in the long run.
i charge $100 ph at the dyno, for the intial tuning, if its not right or needs tweaking, i don't charge addtional fees, even if it needs a few times , i don't charge for street tuning either, and other people get the benefit of any custom tuning since i can provide those updates, the last time i did that it was $25.
i think those going the way of a standalone are being true to the spirit of the hacker, and i wholly support that, but as with life you're taking a tiny percentile.
I just don't see where you get 'costly' from, thats all