Like it's brother GMT-900 truck, the Chevy Silverado, the 2007 GMC Sierra was re-designed from the bottom up — and also like its badge-engineered brother — it shows. The cool thing about the GMC model is the addition of a "Denali edition." And by "cool", we really mean it's probably not cool. Rather, it kinda feels like a shameless extension of the "Denali edition" of the Yukon and Envoy — except...it does look different. But more on that shortly. Feast your GMC-loving eyes on the picture gallery of 2007 GMC Sierra SLT Extended Cab below and hit the jump for the press release.