Re: SRT8 piping
You'll lose power with 3 in. duals on a stock/relatively stock 5.7 WK. A friend of mine tried it on his 5.7 Hemi LX and ended up putting restriction (smaller tubing) back in to get the power back. The stock 5.7 Hemi LX comes with 2 1/4 in. tubing. Unless you've got some big time mods. that's probably what you should use. Remember, the big choke point in the WK exhaust system is in the exhaust manifolds and muffler, not so much with the tubing. I run custom tubular headers and a complete 3 in. single system on my Sidewinder cammed Hemi WK. My Hemi LX, modded exactly the same way, still runs 2 1/4 in. duals. 6.1 LX's run 2 1/2 in.
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.