spiky theres a few companys that make exhausts out there, i deal with alot of em every day and from my experience boxes may look the same but they can be VERY loud

Bensons are very cheep for exhausts but fuck me they are VERY VERY loud on some applications

Bosal seem to male the quiestest systems but there prices take the piss compared to others out there

even arvin/timax can sound a little loud

exhaust dont use wadding to silence the box as such,, its actually to change the direction of the air to make the noise sound different,,,,,, they work the same way as silencer in a gun, easier to get that discribed in detail to understand them