Since its release in 2011 as a '12 model, the BMW K1600 twins--the sportier GT and slightly more Gold Wing-like GTL--have clamped down on the sport-touring category like a six-cylinder DeBakey Bulldog. Everything we thought we knew about big, heavy, powerful STs got rewritten by the BMW--it's lighter feeling, sportier, faster, and generally far more capable than it has any right to be. The inline-six engine has amazed us from Day One with its incredible torque curve, proper manners, and distinctive six-pot shriek to redline. We knew the K1600 would be something of a performance overdog, so the question was this: Is it that much better to justify the large price differential? Our 2012 testbike topped out at $25,035 as equipped--with heated seats, Electronic Suspension Adjustment (ESA), traction control, tire-pressure monitors, audio system, and adaptive headlight. The '13 bikes are mechanically unchanged, only new colors, with a $300-higher base price.