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We've been waiting for this day since December.

That was when, during a concert, Tech N9ne suggested that there was a good chance Eminem would end up on his "Speedom (Worldwide Choppers 2)" track. “We are currently awaiting Eminem’s verse," the Kansas City rapper told an excited crowd. "I hope he does it in time, because the sh-t is f--king dope.”

Good news: He did it in time.

On Monday (Apr. 20), Tech's collab with Em, which will be featured on his upcoming Special Effects album and also features Krizz Kaliko, hit the 'net.

As you can hear, these dudes are rapping at superhuman speeds.

The track follows a long line of Tech N9ne posse cuts that feature a range of MCs chopping -- meaning, rapping incredibly fast. In 2007, there was "Midwest Choppers;" two years later, we got "Midwest Choppers 2;" and in 2011, "Worldwide Choppers," which featured Yelawolf, Twista, Busta Rhymes and a number of international MCs, was included on Tech's All 6's and 7's album.

“I’ve been wanting to work with Eminem for a long time,” Tech told HotNewHipHop last month. “It’s funny saying this on the mic ’cause I haven’t been able to say this to anybody, [but] Eminem finally came through and blessed me with a 24-bar verse, when I only needed a 16.”

The more the merrier.

Special Effects hits stores May 4.