A KINGAIR FLT CREW IS TOLD BY TWR TO EXIT Y4; THEN IT WAS CHANGED TO Y2 WHICH THE FLT CREW DID. THE TWR INTENDED ON THE ACFT TO EXIT Y4 RESULTING IN AN ACFT GAR.

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ATC WAS VERY BUSY TODAY. WE WERE ENRTE TO IAD FROM TUPELO; MS. WE HAD CHANGED TO TWR FREQ. THE TWR ASKED US IF WE HAD HAWKER JET IN SIGHT. WE CALLED THE TFC AND WERE TOLD TO FOLLOW TFC. WE WERE TOLD TO EXIT THE FIRST AND SECOND HIGH SPD TXWYS BECAUSE OF TRAILING TFC AND WERE CLRED TO LAND THE RWY 1L. THE CAPT WAS FLYING AND IT WAS VERY WINDY. WE LANDED AND WERE ABOUT TO EXIT THE SECOND HIGH SPD Y4; WHEN TWR SAID EXIT Y2 WHICH WAS THE 3RD HIGH SPD TXWY AND CONTACT GND. THE HAWKER JET ON Y4 CLRED RWY. WE THOUGHT THE REASON TWR TOLD US TO EXIT AT Y2 WAS BECAUSE WE WOULD NOT HAVE BEEN LEGALLY CLRED OFF RWY. THEN WE HEARD TWR TELL THE ACFT BEHIND US TO GO AROUND. I THEN CONTACTED GND WHEN WE EXITED RWY 1L AT Y2. THEY INSTRUCTED US TO PHONE TWR WHEN REACHING THE RAMP. THEY SAID; 'IT WAS A PROB BECAUSE AN ACFT HAD A GO AROUND BECAUSE WE EXITED ON THE 3RD HIGH SPD TXWY.' THE CAPT CALLED TWR UPON REACHING THE RAMP. HE WAS TOLD THEY WOULD REVIEW TAPES AND CALL US IF IT WAS A PROB. I BELIEVE THIS WAS A COM PROB BTWN TWR AND ACFT. THEY MEANT TO SAY Y4 AND SAID Y2.