Too much noise

I'm running a Carter M4594 out back. It comes with little rubber isolaters. I read it was not that noisy and came with everything for a nice clean proper install. May depend on where and how good its mounted and further isolated, and with most cars with deadener and carpet etc may be fine. In my 100℅ tin can of a van with zero sound deadening it is somewhat noisy, but when rolling is pretty much cancelled out by my loud exhaust.