I just finished up writing a feature on this stock-appearing '06 GMC Sierra, but as you might've guessed by this picture, it's far from stock...

 A built LBZ under the hood, fortified Allison underneath, and all the right suspension and steering fixes available for Duramax trucks have made this 680hp Sierra one nasty truck. The owner won his local Work Stock sled pulling class's points chase in 2013, and we watched it run mid 7's in the eighth-mile (11's in the quarter) as well.

 Make sure you pick up a May issue to get the full scoop...