What aftermarket one are you talking about?
I've had one on salvageV6 that was aftermarket with totally different baffling and it hasn't made any difference at all in actual use. Yeah, I run the thing down 'til the add on low level light comes on too.
I was just going to get an original cause I didn't want to solder the neck on the aftermarket ones and the GM woulda been only $50 more.
I guess I'll shop around for a stocker.
There is supposed to be a new replacement number out there though...