yeah, integrated exhaust manifolds are on the new LFX, started in 2012,, I love them, they are quiet and they look cool and there is no sense in putting aftermarket headers on anyway because the new integrated ones added like 12 horsepower to the car,
I don't know about the exhaust mods, but there are dozens of threads on that already.
2012 1LS Silver Ice - Mods - SS Strut Brace, RX Catch Can, BBK CAI, TRS Bi-Xenon HID's, Blackout Grill, RX65 Radar Detector, 700watt 4 Channel Amp with Kicker Speakers, 4Pack Gauges Added, 30% tint. Baer Drilled Rotors & pads, 20" American Racing. Awesome car.