Re: High flow cat?
My exhaust system guy told me the cats. are already high flow, at least on the 5.7. I think he said they were wire spun, or something like that. Anyway, when I asked him about it, he said don't bother, as it won't make any difference. That being said, I have JBA "high flow" cats. on my Hemi LX, and it didn't seem to make a noticeable difference. One other thing to be aware of in your quest for a little more power is that many of today's mods. make SLIGHT differences by themselves, but cumulatively they may add up to a fair improvement. IMO, the best bangs for the buck are, tuners, low restriction exhaust system, and good CAI/filter, which won't do a thing driving around town, but slightly at WOT.
05 LX/RT and 06 WK/GCO, (modded similarly) with MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tubular 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 85mm TB, SOS Coils/.060 spark plug gap.