Quote:
Originally Posted by laynlo15
Hum, been around for a while, still can't figure out why you want to delete one of the cats? Make it louder, for a couple hp, check engine light? So explain.
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There are 2 sets of cats on the cars now, have been this way since 2009 when GM went to 1 Global USA vehicle instead of the 49 state cars which only has primary cats and the California cars that had primary cats and secondary cats.
The secondary cats are not monitored by the computer system and based on GM previous years are at a HP cost penalty of around 5hp. I noticed my car picked up some power and is a tad bit louder and more aggressive sounding with the secondary cats gone now.