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      02-07-2013, 04:15 PM   #29
RimasRS's Avatar

Drives: 135i MT 2009 AW
Join Date: Sep 2010
Location: Europe

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Originally Posted by mikead_99 View Post
You're not the first guy I've seen say this, but I don't recall seeing any threads about cooked secondaries. A lot of guys run this setup, is this really a verified risk?

And yeah, I should've done this before posting the question, but on the move today and just wanted to get the question out there.
I know this because I have other cars like 320d which had both cats primary and secondary I removed secondary because it was clogged (checked) this was suggested by workshop who is dealing with turbo chargers and they say that primary cat burn cleans by heat secondary catching everything else what's left from primary also they say that clogged cats can cause turbo damage.
Believe it or not but that is what I saw heard and I think it is logical