if i buy the Enginer plug in kit for $2000 2kw, or the 4k or 8k one, how much would it cost to install it all into my car? does the kit from them come with pretty much everything? just curious to see how much total costs would be all said and done. thx ps- only bad thing about the Enginer is that it's limited to 34mph EV only mode right? they said the prius wasn't meant to go faster just on EV... is there a way to get EV mode above 34 mph?