C402 PLT HAD LESS THAN LEGAL SEPARATION IN MIA CLASS E AIRSPACE. PLT WAS NOT ALLOWED TO OPERATE IN MIA CLASS B AIRSPACE.

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ON APR/SAT/02; I WAS PIC OF ACFT X FLT. THE FLT WAS ON AN IFR FLT PLAN TO FLL. WE WERE OPERATING UNDER FAR PART 135. AS THE FLT ENTERED MIA APCH'S AIRSPACE; WE WERE DSNDED TO 3000 FT MSL (BELOW THE MIA CLASS B AIRSPACE) ON A 030 DEG HDG. WE WERE HANDED OFF TO APCH SECTOR THAT HANDLES THE S ARR INTO FLL. WE WERE THEN TURNED TO A 090 DEG HDG AND DSNDED TO 2000 FT MSL. TFC (ACFT Y) WAS ISSUED AT 1 O'CLOCK POS; 2 MI; AT 2500 FT MSL. WE RPTED TFC IN SIGHT. THE CTLR THEN ASKED US TO RPT FLL IN SIGHT. I ADVISED THAT WE HAD FLL IN SIGHT. WE WERE THEN ADVISED TO TURN L TO 070 DEGS TO JOIN THE RWY 9R FINAL; AND CLRED VISUAL APCH TO RWY 9R AT FLL; AND CONTACT TWR. I CHKED IN WITH THE FLL TWR. THE CTLR WAS QUICK TO ADVISE ACFT Z TFC 1 O'CLOCK LESS THAN 1 MI. I IMMEDIATELY BEGAN AND ANNOUNCED THAT WE WERE MAKING A L TURN. WE MADE A 30 DEG BANK L TURN TO ABOUT A HDG OF 030 DEGS. THE FLL LCL CTLR SAID THAT MIA ADVISED US (ACFT X) OF THE TFC. I SAID THAT WE WERE ADVISED OF A 2500 FT PIECE OF TFC THAT WE RPTED IN SIGHT BUT WAS NOT ADVISED OF THE SAME ALT CONFLICTING TFC. I HELD THE 030 DEG HDG FOR ABOUT 30 SECONDS. NOT WANTING TO CONFLICT WITH TFC LNDG RWY 9L AT FLL; I ADVISED FLL LCL CTL THAT I WAS RESUMING THE FINAL APCH. THE CTLR CONCURRED THAT THERE WAS NO LONGER A CONFLICT. I NEVER DID SEE THE TFC DUE TO THE R WING HIGH DURING THE L EVASIVE TURN. WE LANDED RWY 9R UNEVENTFULLY. UPON ROLLOUT FLL; LCL CTL ADVISED ME THAT THERE WOULD BE A SEPARATE INVESTIGATION REGARDING THE NMAC. I WOULD LIKE TO MENTION THAT THIS HAS NOT BEEN THE ONLY OCCURRENCE LIKE THIS EVENT. IT HAS BEEN A CONTINUAL PROB. I PERSONALLY FEEL THAT THE APCH CTLR IS JUST REDUCING HIS WORKLOAD BY PLACING FLTS BELOW THE MIA CLASS B AIRSPACE. SINCE THE C402 IS NOT TCASII EQUIPPED; THE CTLR CAN PLACE THE FLT DOWN BELOW THE CLASS B AND THEN ONLY SEPARATE IFR AND VFR TFC ON A TIME-PERMITTING BASIS; RATHER THAN PROVIDING SEPARATION IN CLASS B AIRSPACE. I UNDERSTAND SEE AND AVOID IS THE PIC'S RESPONSIBILITY. THERE ARE MANY TIMES IN THIS AREA WHEN THERE ARE TOO MANY PLANES TO SEE AND CALL OUT TO MAKE A SAFE FLT FOR A PAX CARRYING OP.