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      12-10-2012, 05:56 PM   #18
RimasRS's Avatar
Drives: 135i MT 2009 AW
Join Date: Sep 2010
Location: Europe

Posts: 2,397
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The main problem is that secondary cats will clog up. Because primary cats filtering and after they becoming worm/hot burning all kind of sh*t. If you will go just with secondary cats they will not last long...
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