I'm pretty sure race cans / systems do this as they actually flow more air so the mixture ends up a tiny wee bit more lean. Because of this, any unburnt fuel will ignite randomly within the exhaust system instead of in the engine which then results in a popping and banging or a flame out the end of the cans in some circumstances.
Personally, I love it. My Renegades pop and bang on the over run with the odd flame here and there emerging from the cans.