You shouldn't have any problems. 16 EEEE here. Haven't been able to test drive one yet (kinda don't want to, until it's MY car

), but I was able to sit in a dealer car a few months back. Since you also drive a Sierra, the biggest adjustment will be visibility at first, and probably the difference in shoulder room. Knowing that..go order!
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2SS/RS IBM A6, White Rallies
Ordered: 4/30/09 Delivered: 8/18/09
Appearance Mods:
Heritage Grille, ZL1 Replica Wheels
Performance Mods:
Flowmaster ARH Cat-Back Exhaust, ADM CAI, ADM L99-LS3 Conversion, ADM LSA Supercharger Kit, Lingenfelter GT9 Cam, Stainless Power Headers, Detroit Speed Sway Bars, ZL1 Fuel Pump
581 rwhp/535 lb/ft tq