Quote:
Originally Posted by djb383
I guess I'm skeptical........what proof is there that aftermarket cats flow more than stock? Is it because marketing/add depts. say so? I don't understand why more people don't invest in a G-Tech Pro to find out which mods work and which mods don't. 
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Good call on being skeptical. The stock cats are pretty close, if not already high flow. Replacing them would be pointless. Even removing them will show a tiny, if any, increase in power.
On an old vehicle with the trash can lid size cats, replacing them would help out a whole lot. On new vehicles, its a waste of time, unless they are clogged. And them becoming clogged would be rare as hell.