Quote:
Originally Posted by mcvaughan
I had Evolve catless headers on my E60 M5. I passed emissions with the tune. FWIW, I never got a CE light without the tune, which I thought was interesting...
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Wow, that's interesting. And I'd have thought the V10 NA engine would be even worse than the F10 is. When you say you didn't get the CEL without the tune, do you mean with the catless headers but before the tune?