Volo FS2 HHO edition chip vs. EFIE O2 Enhancer

Has anybody tried that Volo FS2 HHO edition chip?
OR should I go with EFIE O2 Enhancer :
http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT

Thanks!

Focus on the EFIE, I am not familiar to the one in the link, but having a well design EFIE is a must if you are going to induce HHO, specially if you car is new than 2000.

Yes, my vehicle is 2001 BMW X5 with V8 4.4i
Do you offer any EFIE for sale ?
Price?
Thanks!

http://www.fuelsaver-mpg.com/

Complete the request form

have the Volo FS2 HHO edition chip, would go the other way

What do you mean?
Did not work?
What vehicle and engine size did you install it at?