Easter eggs in vehicles is becoming more common as engineers and designers look to add a little personalization to their new vehicles via clever or informative jokes, drawings and features. The Jeep Wrangler is famous for it, as is the Ford Raptor desert pickup with its Baja maps and hidden badges. It's main rival the Ram TRX may have done it better, hiding a picture of a tyrannosaurus rex eating the aforementioned raptor.

Not to be left out of the fun, Cadillac implanted some Easter eggs in its latest CT4-V and CT5-V Blackwing sedans, paying homage to places it was built and tested. We'll add that with new technologies like laser etching and 3D printing, these inside jokes are a lot easier to produce.

The Blackwing features a map of GM's Milford Proving Grounds in Michigan, which "represents the thorough engineering development that led to two of the fastest and most powerful Cadillacs ever." It also features a map of the GM Tech Center in Warren, which was where the design team did its thing on the handsome five seater.

"The CT4-V Blackwing and CT5-V Blackwing are the quintessential examples of form and function coming together," said Brandon Vivian, executive chief engineer, Cadillac. "This was made possible by Engineering and Design working together from the very beginning to get the most out of these cars. The paddle shifter covers symbolize that union, with the customer at the center of it all."

Those maps, on manual vehicles, are placed where the paddle shifters would go on automatic cars. Additionally, each customer gets a serialized V-Series plaque (though we're not sure that counts as an Easter egg), the Mondrian pattern on the shifter and on the underwing, Blackwing emblem found on the 19-inch bronze wheels and special logos on the air strakes on Carbon Fiber 1 package vehicles. All in all there are more than two dozen.

In addition to those Easter eggs, the CT4-V Blackwing gets a twin-turbocharged V6 making 472 hp while the CT5-V Blackwing sports a supercharged 6.2-liter V8 making 668 hp. Both offer a six-speed manual or ten-speed automatic transmission and we're guessing both will be the last of Cadillac's fire-breathing internal combustion engine. If you want to put one in your garage, the CT4-V starts at $59,990 and the CT5-V comes in at $84,990.