Suggestions for muscle car sound muffler without drone

Dynomax Super Turbo Airflow 70%
Dynomax Ultra Flow Airflow 99%

Sound decibel at 3500rpm:
Super Turbo 88
Ultra Flow 91

As you can see,the Ultra Flow is a touch louder, but out flows the Super Turbo by far. Ultra Flows cost alot more, but it is a much better choice for performance. The straight through design is just what your looking for.

I've been running 40 series Flowmasters. Love the sound of Flowmasters,and yes they can droan.
But after looking at some flow charts,I'm afraid I've bought my last set of them.
It will be between Magnaflow or Dynomax on the next set.