We're not entirely sure why this BMW i3 REx owner decided to remove his muffler in favor of a downpipe after the catalytic converter, but cars will always be tinkered with, so here's what an i3 REx sounds like with this rather odd mod.

Video description:

"Removed the stock muffler and installed a downpipe right after the cat. Engine runs at its warmup speed to 28 seconds, then revs to 4k RPM until 42 seconds before dropping down to idle speed (2400RPM)."