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The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 12-07-2016, 04:05 AM   #1
topher339
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Join Date: Jun 2016
Location: New Mexico/Arizona
Posts: 79
My Ride: 2001 M3
What size cats?

I'm trying to get some aftermarket cats as the ones I have are bad. I have some catless headers on the way so all I need to Euro-spec the car is some cats that will pass a sniffer test. Only thing is, I can't seem to find any place that tells me what size cats I need. From what I've read, 200 cell cats pass fine but I need to make sure they're big enough. So, does anyone have an idea as to how long and wide they have to be?
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catalytic, cats, converter, exhaust, size

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