I also would kill (and I have a list) for an exhaust that sounds a bit electronic like an FX, but the challenges are numerous to match all the exact conditions.

I think the biggest challenge is fitting the entire FX system under our truck.
I'm not sure, but I would guess the infinity FX would have a 1-in-2-out muffler. Things get more crammed if it so happens to have two mufflers...

Also I think we would be taking a bit of a horsepower hit with a stock FX muffler system.

Jack, for a quick "easy" fix, see about throwing on a glasspack resonator after your PV if you have room. I had to to quiet my magnaflow down, worked quite well... see my gallery for how I had to stuff those glass packs in right before the tips. I'm probably going to also add resonator tips for a bit more of a tone down, sooner or later.

I had a MorganTec 1-in-2-out and it was an amazing growl, but with no glass packing or flow blending it developed a huge resonation at 50mph. At 65mph, it sounded a bit like you were in a small plane... Fun for a while, but attracted too much "attention".