anyone ever tried or thought about these on a 4.6 or 5.4 truck?

 

From what I understand, the 1 chamber Flowdaddys are race mufflers and not really intended for street use. It'll be pretty much like having a straight pipe and will definitely be loud.

 

My friend had them on his 4.6 mustang and they were insanely loud. There isnt much difference between those and striaght pipe.

 

It shouldn't be that loud on a truck with a stock y pipe and all the cats. I have Dynomax bullet on mine which is a straight through race muffler and its not too loud. With 4 cats it wasn't even very loud with no muffler at all.