Re: 05 GC Hi-Flow Cat
May want to check the part numbers on the ones you have. If they're the same as the ones on the Hemi's, they're already high flow......according to the exhaust guy that built my complete header back system. I specifically asked him if they needed to be changed and he said, no, they are high flow wire spun (whatever that means) cats. All that being said, I have JBA headers and high flow cats. on my Hemi LX. Maybe they make some that will work on the WK's too. May want to check with them too.
05 LX/RT & 06 WK/GCO, modded similarly, MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tube headers w/3 in. catback, Bilsteins, SRT frt/rear bumpers, Eibach SRT Lwr Sprgs & Sways, FRI Sidewinder Cam Adv 2*, 6.1 valvetrain, SLP 25% UD Pulley, BBK 90mm TB, SOS Coils/.060 plug gaps. 20 in. SRT Reps.