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I always had problems with those cats breaking up and coming apart. The only aftermarket cat I found to last was the ODBII compliant ones from Magnaflow. But they are much more expensive than the Catco.
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F-Bodyless 
01 GMC Sierra C3 6.0L, AWD, Westers Tune, K&N, Hella LED Tails
03 Pontiac Grand Prix GT, GMPP Handling Kit, LS1 F-Body Brakes
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