The Superchip "Bluefin" allows you to plug into the onboard diagnostic port under the steering wheel and select whether you want the car to be standard or have the performance map. Whether you have the standard or the performance map selected and take it into a dealership the map is invisible to them. The part that is important is that when you take it into the dealers they can re-flash the memory of the car and put in their own standard map. In a case like this (which has happened) a Bluefin would no longer work. This is because the Superchips maps (Standard and Performance) are paired up by Superchips and when the dealership reflash the map there is no longer a paired set of maps. Where this has happened you would have to get in touch with Superchips and re-pair the maps back up for them to work.
Some ones been doing their homework 
More than you know! 
Does it mean you've ordered one of those things? 
No I haven't decided on my tuning product yet as I thought I'd wait until she's loosened up a bit more (4-5000 miles - ish), but I like to keep pace with things and I have been down to my local Superchips dealer for the full monty on how it works (they know me quite well due to having my last 4 cars chipped and having Milltek exhausts etc fitted by them).
I have been looking at others too, but only Oettinger offer a similar product, but at more than twice the price and currently non-reversible
Revo and APR are two other tuners who may well end up with similar products for the ED30 but only REVO's would end up reversible due to the methods they use.
