I'm researching this topic for my uncle, please forgive me if I am missing some details. He has an '09 SLK that is a tad too quiet for his liking. He asked that I look into exhaust options that would give his car a bit more of an aggressive sound. I have not had much luck with finding answers on this topic. Have any of you gone to a freer-flowing (and presumably, louder) exhaust? What have you tried? Anyone used an AMG exhaust on your standsrd SLK? My uncle spoke to a Mercedes mechanic who initially suggested the AMG exhaust, but by the end of their conversation he suggested leaving it alone. I'd love to hear what others have done. Thanks!