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As a new '16 owner, I can definiely tell that the new Twin-cooled motor is much more robust than either the 103 in my '10 Limited and even the 110 in my '12 CVO Ultra. The additional compression and the new cam really do make a difference.
Chances are, depending on what exhaust you're running, that your tune is leaving power on the table. With that said, these are big, heavy Touring bikes with archaic engines. You can throw a ton of money at them trying to make them more powerful (Lord knows I have), but they're still going to be slow bikes.
Comparing apples to oranges. Last bike was a 2012 Super Glide. 96" with FP3, K&N Street Metal intake and Rinehart 3.25" slipons. Current bike is 2014 RK, 103 HO. I've added a basic stage one with FP3, PM Super Gas intake, S&S Power Tune duals and MGS 4" slipons. From my seat of the pants experience with both bikes I believe the Road King would eat the Super Glide easily in a drag race. JMO.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.