Performance has never been the weak suit of Ducati's innovative and charismatic Diavel sport cruiser. But that didn't stop Bologna from giving the Diavel a revised version of the torquey Testastretta 11-degree engine featuring dual spark plugs in each four-valve cylinder head. Along with a new exhaust system and other refinements, the Testastretta DS keeps its 162-hp peak but gains a couple of pound-feet of torque, to a new peak of 96.2 at 8,000 rpm. Ducati says the "L-twin" engine is smoother than ever. One other update owners will appreciate is an extension to the valve-clearance check, which is now at 18,000 miles, up 3,000 from before.