So, i know im going to get CAPSLOCKED by a lot of you for asking this but what is the go with these ebay chips? http://cgi.ebay.com.au/15BHP-Chip-Ford-Falcon-XR6-8-AU-EL-EF-EA-EB-XG_W0QQitemZ200387750958QQcmdZViewItemQQptZAU_Car_Parts_Accessories?hash=item2ea80a6c2e&_trksid=p3286.c0.m14 Like, what exactly do they do ? modify the ECU? sounds a little Iffy..
Can they damage your car?

all they are is a resistor pretty much. as far as i know, all it does is make the ECU think the car is cold all the time, so it runs a richer fuel map, until the ECU relearns, and it becomes useless. not that it isnt useless in the first place, lol

haha ok thanks for the replies guys.