I have been running stock 42 pilots, the tbike pipes , freak and tbs needles in my 03 Speedmaster since about 2004 and this combo has worked flawlessly for me. This bike has been driven hard since day 1 with no problems. Tried 152's to start but that was way to rich. My altitude ranges from about 2700 ft. at home to as low as 1000 ft. When traveling.
