We've been waiting far too long for this, but Cadillac has finally delivered. It's the 2016 Cadillac ATS-V, with 455 horsepower, a 0-60 time of 3.9 seconds, and a top speed of 185 MPH. Say hello to the latest threat to the BMW M3/M4 dynamic duo.

Between the leaked pics and initial specs, we thought we knew just about everything about the ATS-V coupe and sedan. Not quite.

It's packing a twin-turbocharged 3.6-liter V6, routing 455 HP and 445 pound-feet of torque to the rear wheels through either an eight-speed automatic or – holy of holies – a six-speed manual equipped with Active Rev Match for the heel-toe-averse. Final curb weight still hasn't been released, but we're hearing something in the neighborhood of 3,700 pounds, partially thanks to a standard carbon fiber hood.

But the power isn't what has us frothing at the mouth. The chassis has been gone over to increase overall stiffness by 25 percent, with new gusseting and a V-brace spanning the engine. At each corner is GM's third generation Magnetic Ride Control which adjusts to the road conditions in milliseconds – 40 percent faster than the last gen system. Joining the new MRC, Performance Traction Management system, and e-diff are 14.5-inch discs up front and 13.3-inch rears, each squeezed by Brembo calipers (six piston up front, four in the rear), and framed by forged alloys sized 18 or 19 inches and wrapped in Michelin Pilot Super Sport rubber.

Optional kit includes a Carbon Fiber pack with a new wing, splitter, and venting, while a Track Package adds the Corvette's Performance Data Recorder, a smaller battery, along with nixing the floor mats and tire inflator to shed around 30 pounds. Recaros are mounted up front and there's the normal assortment of multimedia bobbles, including the insufferable CUE system.

Sales are set to begin this spring, but prices haven't been announced just yet.