Is there any chips that really work?

[o2$pit]

i bought a chip off ebay and it way a little resister that did nothing except turn my check enginr light on, is there any that work? also thinkin about nos i know alot about if i can use it on my stock engine of how big?
responses much appreciated

 

[Quik LS]

Here is the post I made after we worked with SCT and got it working on the LS for the first time -> http://www.lincolnvscadillac.com/showpost.php?p=27874&postcount=8


Changes since that post:
- SCT came out with a better unit - XCalibrator2
- no need to pull fuses anymore
- Torrie's business is now called 'FastPartsNetwork.com'


do a search on 'SCT Flasher' - there is alot of good reading on it.