Wondering if i should get Hi-Flow cats put on my truck want a loud truck have 40 series flowmaster to quite for me want a louder truck wondering what company makes cats and if anyone has done it to there truck and see improvments?

 

Nah, stock cats flow like a *****. I'd invest in a good set of headers to get some more sound. 40 Series are already loud so I don't know how much louder you are trying to get.