you don't need the avc-r, it's nice and all, but.... as far as hondata, that is a totally different route, if you have a v-afc you can use that and bigger injectors for fuel management and that's all you need, however if you're talking about getting hondata, you no longer really need the v-afc, but hondata is a lot more expensive. you don't need an electronic boost control(avc-r in this case) they are just nice to have, but there are cheaper ones out there if you really want one.