Quote:
Originally Posted by RaysM3
California Smog has visual inspects of all cats and yes modifying or removing the cat voids drivetrain warranty, well in my case that is.
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What's unique about your case?
Yes removing/fiddling with cats is illegal in CA, but that is unrelated to your warranty.
Fiddling with any part of your car will jeopardize the warranty
for that component or related equipment. Thus, your exhaust is probably no longer warranted, but your headlights are. BMW would have to demonstrate that your removal of the cats caused a drivetrain issue in order to deny a drivetrain warranty claim.