Hey guys,

Whenever I am at idle and then rev the engine and hold it at 2k-3krpm, it
almost sounds like sporadic fireworks in the distance. I can hear a faint
"boom", if that's what you call it. What could be causing this? The timing
should be right, which I thought may be the culprit. I've only started
hearing it since in my new exhaust, but that's probably just because the old
one was so loud I couldn't hear it. Any ideas?

Thanks!

-p