The day after we did the service, the day I was heading back home from my folk’s house, my brother decided that the Sporty should sound like a Harley. The new Harleys are actually very quiet, though they do still sound good, they don’t sound like what one thinks of when they think of a Harley.
So it was off to my dad’s work to make some modifications! We first started with a 3/16″ or 1/4″ extra long drill bit, and drilled 3 holes in each baffle. This opened up the sound a little bit, but it was still rather quiet. So, after finding a 1/2″ long reach bit, we drilled a 1/2″ hole in each baffle, right at the bottom of them. This netted 3 1/4″ holes and 1 1/2″ hole in them. This really opened up the sound, and they got a good rumble, a good crackle and it sounds really good.
It didn’t affect the performance either, and there is no lean “pop” on acceleration or deceleration either. My understanding is you can modify and change the exhaust on the EFI Sporty models without necessarily needing to do a remap of the EFI controller. But, I have heard of guys that had to because it leaned it out after drilling the baffles.