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Not positive but i would think the Cats would probably be 3". Then afert the Cats it would either stay 3" or drop down to 2.5".
Take a look at this pic. It looks like 3" in and then tapers down to 2.5".
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-2010 Camaro 2SS | M6 | VR w/White Stripes | 1 3/4" KOOKS - 3" Magnaflow | LPE 3.91 gears | ADM tuned | Halltech w/ADM Scoop | Spohn/BMR Trailing Arm/Toe Rod | BC Coilovers| Pedders FE4 ZL1 swaybars | Cradle/Diff/Radius Rod bushings | VMax TB | Morimoto Projectors | MGW shifter | Red Calipers
Build Journal

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