I like the AVC-R for all its options but its not cheap. As for boost spike i use a mbc from extreme and it doesnt spike at all. If you look at all the really fast dsm`s they all use mbc not electronic ones. Cant say anything for other turbo cars. If i was to buy a ebc for the money i would consider the profec B II. I like the fact that it doesnt open the wastegate at all till you reach full boost.