I seen these +15 BPH module on ebay. They are made by Celox and were recommended by Max Power magazine. I bought one and they are only €9.40 with free P&P to Ireland.
It seems like a decent amount of extra HP for very cheap. (Too cheap??)
Does anyone know anything about them? I'm just a bit cautious that it might make the engine run to lean.
Here's the link for them on ebay.
http://cgi.ebay.ie/15BHP-Power-Module-M ... 240%3A1318