A chip leaves a code in the ecu that a delaer can easily find. He does not need to look at your ecu to pull the code, simply plug his equipment into the port and the code will tell him a chip has been used. I am a Dealer for Superchips, DiabloSport and about 50 other companies I now tell ALL customers that their warranty can be comprimised by modding the truck. I fought with Ford for 2 months before they decided to fix my truck, the engine blew at 5400 miles. After all the fighting, we found that the main bolts were not tightened at the factory and 2 main bolts fell out and a third was about half out. Ford paid dearly, but, I was without a truck for 3 months. I am not the only one, a kid in Texas called me about a year ago with the exact same problem, a blown engine and Ford told him, "warranty denied, tampering with PCM"
DT
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Danny aka Cajun -- " STOCK" Harley Number 8327...Did I say "STOCK"