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      08-03-2011, 11:28 AM   #8
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Drives: 1M - GIAC:S2
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Location: Boca Raton, FL

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What happens if you go catless? Secondary or both?

Originally Posted by KIYO View Post
I think it is controlled by some formula.
I am monitoring the engine load and the RPM.
I found out that if the engine load is low, it doesn't get louder at around 2500RPM.
This is a good point. So it does not just depend on RPM, but also which gear you are in and the speed in which you are traveling at...

I wonder what the loss/ gains would be to going catless or secondary catless. I am very tempted, I just do not know enough to make the educated decision. Will I lose power? Would I gain power? Is it more complicated than that? Does BMW have a special formula to make the cats work in junction with everything else? What is truth in this matter?
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