I've searched it, I know it's been covered but I didn't wanna start those threads up again. All of them had a lot of arguments on them. Haha. Anyways I have a '90 gtu with an 04 gto ls1, it has 3 inch all the way back to magnaflows. It's a little loud. I have some pretty new racing beat dual mufflers but they are the N/A versions so I think are a little smaller diameter. Is it going to be a whole lot quieter with those? And will it reduce power too much to even bother with? Thanks.