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Old 01-10-2004, 11:05 PM   #2
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Join Date: Jul 2002
Location: Toronto
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I have the same setup on my 540i adam, when the 2 cats meet into the y-pipe that's where the O2 sensor goes, after that it's just 1 large pipe all the way to the back, because the pipe is larger after the cat the flow of the exhaust is still free flowing, that 1 pipe is almost as large as the 2 pipes before the cat, so I don't see any compromise there

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