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17-year-old Chief Keef was caught ON TAPE shattering the speed limit in Illinois this week -- allegedly doing 110mph in a 55mph zone -- and TMZ has dash cam footage of the subsequent police chase ... and arrest.
The video starts out pretty tame -- until out of nowhere, Keef barrels past the idling police cruiser in his BMW X6 M ... and the cops peel out after him. It takes roughly two minutes for officers to catch up to Keef and pull him over.
"This a fast car, that's why I bought it" - he replied (as heard on the video) ... lol
As we reported, Keef was eventually arrested for speeding and having too many people in his car (he only has a driving permit). The arrest is also on tape.
But the best part -- wait 'til you hear the arresting officer's voice when he finds out Keef's got $8,000 CASH in his pocket ...