Both of those pics, me riding and the one on the lift, have the 2" rear lowering kit in it, as well as the 2" front end lowering kit that i've been developing.
I think it'd be fine without lowering it also... especially if you leave the stretch kit at its shortest position.
Personally my favorite "look" and riding feel is with the stretch installed, but at its shortest. This to me gives the best proportions, makes it not look SO short, but also not terribly long. The stretch wouldn't really hurt the cornering capability of the bike, unless you are racing on kart tracks maybe... lol! But on the road, it turns and handles great with it because turns aren't THAT short... and to ME personally, i find it a lot more stable entering a long turn at-speed... since the shorter stock wheelbase makes it TO ME feel kinda "washy" in the rear, or rather, the bike feels like it wants to over-steer/be twitchy a bit much... but of course i'm not a professional road-racer, just an average street-rider... so your mileage may vary
As for the 6" rear lowering kit, here is the 6" rear kit with one of the prototype 2" front end lowering kits, with the RaceBarZ installed (Bike belongs to
09challengersrt)...