I had the G3 first, then the Dual Exhaust, just like you.. the cats added 50% to my enjoyment of the car. Sharp. Responsive. Alive. You know how it sounds when you're at a race and all the GT cars come down the straight and brake into the turn and they rev match the downshift and how awesome it sounds? There you go.
You'll need a tune with cats though, and UpRevs are north of $600 this year, so budget a grand overall to complete your build if Cats are all you have left..
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