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Old 07-07-2008, 01:12 PM   #1
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Default New GM catalytic converter vs Aftermarket High flow

I have an 02 Bonneville SSIE all stock at the moment. I plan on gutting the air box and maybe going to a 3.5 pully and 180 t-stat and a new PCM from INTENSE.

currently i'm getting a cat code and the cat needs to be replaced, it'* still under warrenty from GM. Will the NEW stock cat flow well enough or should i just skip it and go straight to aftermarket?
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Old 07-07-2008, 07:35 PM   #2
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if the GM one will be free because of the warrenty, then go for it. Honestly the only reason people go to the aftermarket is because the cost is cheaper.

there was no really difference except for a little louder tone from the people that have changed
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