Have an exhaust question. I am going to keep my 454 pretty much stock, manifold back 2.5 inch dual and leave the rest bone stock, but I was wondering about these One Chamber Flowmaster Race Mufflers? Anyone have any info on these? Would they be nice and loud?

They will be loud, as in ignorant loud. I'm not trying to slam you or sound like an old man here, but if you put those the car, you are absolutely asking for a ticket.:sad:
Just my opinion, and mine only. Good luck whatever you do.:)

Take a look at the Magnaflow large case mufflers or for quiet performance - go to the large case (Hemi) Dynomax turbo mufflers.

I Love Loud Exhaust But Those Are Too Much In My Opinion. Currently I Run Dynomax 2.5 Ultra Flow And They Are Loud Enough To Get Attention Any Time I Want It

on my 454 im running the old school 2 chamber 40 series flow master mufflers the sound good at idle and when you get on it then you really know it is coming