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Exeter pulled off a stunning Aviva Premiership upset as leaders Harlequins were sent crashing to a 27-16 defeat at the Stoop.
Quins were marginally the better side for much of the contest but aside from a Ugo Monye try that put them in front early on, they could not break down a stubborn Chiefs defence.
The hosts led with 12 minutes remaining but Exeter, inspired by fly-half Gareth Steenson - who contributed 17 points, produced two late tries from Damian Welch and Luke Arscott as their bid to qualify for next season's Heineken Cup was given a boost.
Nick Evans and Ben Botica kicked the rest of Quins' points.
