Quote:
Originally Posted by Poochie
You're tampering with a federally mandated smog control device, that's a slam dunk warranty denial from BMW AG. You know, the ones that actually pays for the repairs and by extension, the paycheck of genius who's spreading misinformation.
BTW, he'll probably be gone and working for Audi, by the time you have to make a serious claim, employee turnaround is pretty common in the automotive service industry.
Why do think a "sports cat" performs better than the stock unit?
Is it because BMW secretly hates us so they stifles the exhaust flow, for spite or maybe the high-flow cat is circumventing the set emission standards and making end-run around the mandatory level of scrubbing.
I'm not some tree-hugger; as far as I see, the world is already fvcked, we're just merely adding to it, so you do whatever you please.
However, let's be real here; when it comes to BMW AG paying for the repairs of anything related to the drivetrain, having an aftermarket catalytic converter installed doesn't work in your favor, especially since there is already an 8 year or 80,000 mile federally mandatory warranty, on the stock catalyst, so you really have no excuse for interfering with it, while still covered under the manufacture's factory warranty.
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^^^This. When BMW asks why you replaced a perfectly good catalytic converter what's the response? "Power increase?" which will immediately be met with "Engine was not designed for additional power which led to increased stress and XXX failing". Case closed at that point.
Even if you did try and take it to court at that point not only would it take months to resolve your chances of winning are near zero.
It's really easy to avoid all of this. Have an independent shop put it on/take it off before you bring it into BMW dealer for issues. We're trying to do you a solid favor here based on a lot of previous experience with new cars under warranty and dealership issues.