Yeah when I put my apexi N1 on it was a lot quieter than it is now. First thing, make sure you have the silencer out of it. As you drive around for the next couple of days you will notice little particles flying out of the exhaust. I am pretty sure its some sort of packing material for the new muffler. Anyway, after all that has worked it way out, the exhaust will open up and scream to the world. It's weird how it works, but you will be fine.