It's wonderful when a product you took a leap of faith to buy breaks without you causing it to, and you cannot contact the company to repair it. I bought the SL50 from Savefuel.ca, and people be warned, you NEED an EFIE to make it work at least. It was not cheap to have both units installed, and it is NOT EASY TO INSTALL unless you know a lot about electronics already, and who does? Erg, this stuff is kinda boiling up. It's been a real pain to get this thing working. The unit worked before, but without the EFIE, i got worse mileage... read full review »