Smog laws - yes we do in the state of Georgia. If necessary, I can get around that pretty easily.
The torsion bar info. came from another source (Infamous Nissan Forums). That doesn't make sense to me either, since both 2WD and 4WD torsion bars fit the 2WD chassis.
The big thing here is the fitment the Collector and Y-Pipe.
Not only that, but option #1 and #2 are pushing $600.00/ with coating. All that for about an estimated 10-15 HP.