Since the Hooker cats are so quiet does adding LT make it much louder?

 

If by cat's you mean cat-back,just give it a little time to break in,mine was very quiet when I first got it, but after a couple of months it is significantly louder.

 

When I had hooker LTs on the hooker cat back was a lot louder. It was really deep and sounded really good. i was running an ORYP with the headers. But SOSLOW is right, mine was quiet but after some time it has gotten significantly louder. I no longer have the headers on due to recently getting my car smogged.