PSA for those with Aftermarket Exhaust

[ConspicuousConsumption]

Today I learned. Never knew about such things. Off to get my drill

 

[speedracer05]

That's it? That's not bad. I had no idea but that seems easy enough.

 

[ConspicuousConsumption]

Believe it or not, 3.25 cups out of mine. The driver side was 2.5 cups, mostly just yellow. My passenger side was sooty, which lines up with my passenger side having terrible exhaust tip dirtiness. Still not sure why.
Thermal 2.5”

 

[Toadster]

3/16” is more than enough…either the front or lowest end of the muffler right at the seam and in the center.

would one in front and back be recommended? or just one hole is good enough?
has anyone confirmed the sound improvement/un-improvement after the water is drained?