How would these sound? Everything else is stock on the car. Would I even notice any gains?

How about those muffler eliminators?

It will sound great! I'm not sure about the muffler eliminators but the changing of the exhaust will not only provide a good more performance but spruce up the sound department!:thumbsup:

I have Borla Stingers on my 89 vert, nice sounding exhaust but a little loud in the cabin :thumbsup: