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So, my recommendation is to buy a used Genuine one. Even though this is not technically legal, new inexpensive aftermarket cats are garbage. The used OE one should last a while. I wouldn’t be surprised if the aftermarket pieces need to be changed for every emissions inspection.
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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32
Hers:
1989 325iX
1996 911 Turbo
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