Anyone running 70 Series Flowmasters?

[jmking9]

Looking to see if anyone has went from 40's to the 70 series.
First a little info on my current setup: 355c.i. RPM aluminum heads, 284 Comp XE cam, full length headers, 2.5" exhaust (no x or h pipe) with FM 40 series dumped in front of the axle. While this setup sounds great to me, I would like to tone it down just a bit. I still want to keep it dumped in front of the axle.
Before I spend 300 bucks I wanted to see if anyone had any experience with this swap. All the videos on you tube don't demonstrate the difference in interior drone. And that is the main reason I would like to try something quieter. Thanks for any input.