Floyd Mayweather Orders New Rare $2.5 Million Supercar

Floyd Mayweather is about to add another insanely expensive whip to his collection -- 'cause the boxer just ordered a $2.5 MILLION supercar ... TMZ Sports has learned.

It's called the KODE57 enji ... and high-end car enthusiasts have been geeked up about its debut for a long time.

We're told the very first one was put out on display to the public moments ago at an exclusive car show in Pebble Beach ... and Floyd has already placed his order.

We spoke with Floyd's car guy, Obi Okeke from DoctorBugatti.com and Liquidtorque.com, who confirmed the order.

"This is a car Floyd has been highly interested in and psyched about getting."

"I have been working on this project for 6 years and Floyd has been my main target in getting this car ... so he is pretty excited in finally seeing it and getting it."

Obi says only FIVE of the cars will be made -- "I am the only representative in North and South America to sell this car."

Congrats.