Can a muffler be too large to effectively silence the exhaust

[67-LS1]

In my Chevelle I have a 3.6 liter engine with a 2.5” system, an X pipe and dual 2.5” in/out mufflers. The mufflers are 50 series Flowmasters.

For comparison, a 1970 Cadillac Deville with a 7.7 liter engine uses a 2.5” system with wye pipe to single 2.5” in/out muffler. Probably a pretty darn restrictive muffler too.

My car is too loud for me as a driver. Mostly drone. And being a V6 it’s not like is has a real good sound anyway.

I’ve seen mufflers that have smaller outlets than inlets and wonder why. I’m also wondering if dual 2.5” system is too large for 3.6 liters.



I’m leaning towards Dynamax Super Turbo mufflers and am wondering if I should stay with 2.5” or reduce down to dual 2.25” or even 2”.

If I do change mufflers size it will be just the mufflers. The rest of the system will stay 2.5”. Will my tail pipes to the bumper amplify sound from a smaller outlet muffler?

Any experience or thoughts?