What do you guys think about this performace chip on ebay ? It says 50 HP gain and 15 mpg but that seems a little sketchy to me... Has anyone even heard of LSD motorsports?

http://cgi.ebay.com/ebaymotors/PERFORMANCE-CHIP-MAZDA-MAZDASPEED6-2006-2007_W0QQcmdZViewItemQQhashZitem
19b9e77d55QQitemZ110493138261QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

All of those "chips" are bogus. They will do nothing for you. There have been all kinds of studies on them and there is no measurable difference in HP or MPG.

Here's an article Popular Mechanics did on several of those type of scam devices.

http://www.popularmechanics.com/automotive/auto_technology/1802932.html?page=1

Great article- Sounds like it's all BS (surprise!). I especially like the 1% statement and theory.