I've got 40 series Flowmasters on my '70 Challenger where the stock resonators would be. I'd like it to be just a bit quieter and was thinking of adding some small round mufflers, maybe glass packs, where the stock mufflers would be on either side of the fuel tank between the over-the-axle pipes and the tips. Has anyone done this? Did it help? What are the pros and cons??

As always, thanks for your input!