It's somewhat small at the moment, the number of aftermarket exhausts for the 3.3. It'd be nice to have a list, maintained. This is probably more of a US thing or so, because in Switzerland we're regulated to death with the legal options. Atm I only know of: - SEMA Borla ... with no idea if this going official? - SEMA AMG Exhaust. A gag? - Bastuck. Seems not to have that much roar. - "Updated thing from Kia". Apparently there's a "sport" exhaust or so mething now. What I saw doesn't sound like much and is hideously expensive. - JUN B.L. Korean thing I think, where I have no idea if this makes it to Europe myself. My favorite is the Borla .. that thing roars. But it would have to have a "silent" option or simply behave in normal driving if you don't hit the pedal much. Nothing gets on my nerves more, than a sport/performance exhaust, that constantly drones and annoys on long voyages.