NMAC BTWN 2 SMAS AS SECOND ACFT PERFORMS A BUZZ JOB ON #1 DURING GAR.

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ON APCH TO LNDG I CALLED THE DVT TWR WITH MY POS ABOUT 8 MI DUE W FOR A LETDOWN ON 25L AND WAS ADVISED TO RPT OVER 'DIGITAL' CHKPOINT (A BUILDING ABOUT 2 MI SW OF THE ARPT). APPROX 2 TO 3 MI W OF DIGITAL; I SAW TO MY L AT MY 9 O'CLOCK POS; AN SMA Y FLYING PARALLEL TO ME AT ABOUT MY ALT AND SEEMED TO BE MATCHING MY SPD AND COURSE. I CALLED AND ADVISED DVT TWR WITH THIS. NO RESPONSE OR ANSWER FROM TWR. I AGAIN ADVISED TWR WHEN ABOUT 1/4 MI FROM DIGITAL. STILL NO ANSWER FROM TWR. I AGAIN CALLED MY CHK-IN POS WHEN OVER DIGITAL AND; AFTER LOOKING (AS MY PAX WAS ALSO DOING) AND NOT SEEING THE SMA Y; BEGAN MY PROC TURN TO MY DOWNWIND LEG. DURING THIS TURN I SAW THE SMA Y AT ABOUT MY 8 O'CLOCK POS ALSO IN A SHALLOW L TURN. I'D GUESS HIS POS TO BE ABOUT 200 OR MORE YARDS BEHIND ME; AND HE SEEMED TO BE CLRING TO MY L BEHIND ME. BY NOW I WAS AT MY PROC DOWNWIND TURN POS WHICH I EXPEDITED TO THE R. I'M NOW NEARLY ABEAM THE TWR AND AM GIVEN A VERY GARBLED LNDG CLRNC. NOT EXACTLY SURE TWR WAS TALKING TO ME; I ASKED FOR A REPEAT; WHICH THEY CURTLY DID THIS TIME USING MY CALL NUMBERS. I CONTINUED MY LNDG LEGS; BUT WHILE ON BASE LEG HEARD TWR TELL SOMEONE IN BACK OF ME TO 'GAR.' AFTER MY BASE AND OVER THE FENCE TWR AGAIN TOLD THE FOLLOWING ACFT TO 'GAR.' I CONDUCTED A SHORT FIELD WHEEL LNDG AND; AT ABOUT THE SAME TIME MY WHEELS STUCK; THE SMA Y BUZZED STRAIGHT OVERHEAD AT AN ALT OF FROM 50 TO 100 FT HIGH. THIS 'BUZZ' JOB WAS AT HIS FULL PWR AND IT QUITE UNSETTLED ME; BUT DID NOT CAUSE A LNDG PROB. I THEN TAXIED TO MY PARK AND; AS I WAS CLOSING THE BIRD DOWN; AND WITH MY PAX DEPLANED; THIS BIG SMA Y CAME TAXIING IN AND ROLLED UP WITHIN ABOUT 30 FT; AT HIGH SPD. THE DOOR OPENED WHILE STILL ROLLING AND PROP WINDMILLING; AND THE PLT RAN TO ME CURSING; THREATENING HE WOULD RUN OVER ME NEXT TIME; AND GENERALLY BADLY BERATED ME WITH AN ENDING THREAT REPEATED SEVERAL TIMES THAT HE WAS FILING A 'NEAR MISS' ACTION AGAINST ME WITH FAA. LISTENING TO THE FAA TAPES PRETTY WELL CONFIRMS MY ACTIONS AND EXPEDITED PROCS; EVEN THOUGH THE TAPE IS OF VERY POOR QUALITY AND; IN PLACES; NOT CLR AT ALL. MY REQUEST FOR A COPY OR TO MAKE A TAPE OF IT WAS REFERRED BACK TO THE FAA IN WASHINGTON PER MY REQUEST IN WRITING. I HAVE 3 GND WITNESSES WHO STATE THEY THOUGHT THE SMA Y AND I WERE A FORMATION FLT AS THEY SAID THE SMA Y WAS AT MY IMMEDIATE REAR; NO FURTHER THAN 5 OR 6 ACFT LENGTHS (ABOUT 200 FT) THROUGHOUT THE COMPLETE APCH. THIS CLOSE PROX WAS UNKNOWN TO ME AT THE TIME. NOTE THAT TWR NEVER EVER ADVISED A LNDG SEQUENCE FOR US; NOR DID THEY EVER ATTEMPT A SPACING UNTIL WE WERE ON A LATE BASE LEG AND THEY ADVISED THE SMA Y TO ABORT HIS LNDG AND GAR; WHICH HE DID NOT DO EVEN AFTER THE SECOND TWR 'GAR;' AND AFTER HE SOUNDLY BUZZED ME ON THE RWY. NOTE THAT THE SMA Y PLT IS A LICENSED COMMERCIAL PLT AND WAS; I FOUND OUT LATER; MAKING A DAILY 'MILK RUN' AND WAS CARRYING EITHER 3 OR 4 (THAT I COULD SEE) PAX AT THE TIME.