Hello!

Thanks for the response 8 Ball; it's only a twin, and both pipes passed the water test (luckily!).

I dragged my ex-mechanic boss outside to have a listen, and he noticed that my idle speed is a little high, so my popping noise could potentially be attributed to that. I'm gunna lower the idle after my ride home from work and see if that makes the noise less frequent.

I'll report back later!