Big block exhaust is still loud

I checked the box and I think these are them.....perfect English.

Dynomax Performance 17233 Dynomax Ultra Flo Welded Mufflers | Summit Racing

I have the pipe to run out the back, but for giggles Ill check to see what the cost is to reduce to 2.5 from the axle back.

Maybe need to just get it out of the shop to hear it outside like a previous member noted.
Thanks fellas!!