pig lean from the factory to abide by EPA regs. If you put more air through with the AC and pipes, it be even leaner. And that's in winter.
At LEAST do the harley stage 1 flash. Next up would be something like a power commander III (or Fuel Moto equivalent). After that, the sky's the limit. I went with a PC V with Autotune. Had the PC III on my Low Rider and loved it.
04 Lowrider (Gone but not forgotten)