5Series.net - Forums - 3" high flow catalytic converter

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KREED_550i

10-16-2010 11:30 AM

I'm thinking about replacing my Catalytic Converter to a high flow model. My first question is - I think I saw two flowing into one when I had my RPI installed, is that right? What's the difference in just removing the Cat vs installing a high flow model? Are there any chances of throwing off error messages? Power gains\loss? Noise gain? I'm pretty happy already with the sound of the RPI catback. Thanks in advance.

Isaiah_Charles

10-19-2010 08:41 AM

Bump, someone once told me "BMW motors need the pressure of an OEM cat" idk how true that is b/c I have the same interests and questions as the OP

pukka

10-19-2010 01:17 PM

a 3" cat is a waste of money unless you have a full 3" exhaust behind it and some headers in front of it.

FRONJONI

10-20-2010 03:32 PM

^^^ :thumbsup:

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