UNCOORD UNAUTH PENETRATION OF CLASS D AIRSPACE. PROX OF MULTIPLE ARPTS.

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DEPARTED FROM AN UNCTLED ARPT LOCATED APPROX 5-6 MI S OF THE CTLED ARPT IN QUESTION. BOTH ARPTS HAVE NW/SE ALIGNED RWYS. THAT DAY PREVAILING WINDS FAVORED DEPS AND ARRS TO THE NW. OUR PATTERN WAS BUSY WITH LIGHT ACFT AND ONE IN PARTICULAR DEPARTED AHEAD OF US. OUR ACFT (NA-B25) IS SIGNIFICANTLY MORE COMPLEX AND FASTER THAN THE REST OF THE TFC IN OUR PATTERN. I ELECTED TO DEPART STRAIGHT AHEAD FOR ABOUT A MI AND THEN TURN R DEPARTING ON COURSE INSTEAD OF TURNING L AFTER TKOF FOR A DOWNWIND DEP. THIS DECISION WAS MADE BECAUSE I DID NOT WANT TO MIX WITH OTHER; MUCH SLOWER TFC. ALSO; A WIDE DOWNWIND DEP A LITTLE WIDE TO AVOID OTHER DOWNWIND TFC WOULD HAVE POSSIBLY PENETRATED THE MINNEAPOLIS INTL CLASS B AIRSPACE BOUNDARY. WHILE PERFORMING AFTER TKOF AND CLB PROCS; I HAD THE COPLT IMMEDIATELY CALL ST PAUL TWR TO INFORM THEM OF OUR POS AND OUR INTENTION TO PENETRATE THEIR CLASS D AIRSPACE. INITIAL RADIO COM WAS GARBLED AS WELL AS TWR CTLRS TALKING WITH OTHER TFC IN THEIR PATTERN. BY THE TIME WE ESTABLISHED CLR COM WE WERE ON THE ESE SIDE OF THE ARPT. THE LCL CTLR WAS UPSET THAT WE TOOK SO LONG TO ESTABLISH CONTACT AND THAT WE FLEW ACROSS HIS FINAL APCHS. THERE WAS NO TFC CONFLICT AT ANY TIME. WE EXPLAINED THE SIT WITH THE RADIOS. I DISPUTE HIS COMPLAINT ABOUT FLYING ACROSS HIS FINALS BECAUSE FROM W TO E WE WERE STILL WELL S OF THE CONFINES OF A NORMAL PATTERN. ONLY TFC ON A LONG STRAIGHT-IN 5 MI FINAL MIGHT HAVE INTERFERED. 3 THINGS I MIGHT HAVE DONE DIFFERENTLY: 1) CHANGE DEP PATH. 2) CHK RADIO CLARITY. 3) CALL ST PAUL TWR SOONER.