Originally Posted by tomwac

Well, I'm having 4.4 mufflers installed next tuesday, so I'll let you know how it behaves . It does involve cutting and welding though, but the look will be so much better I don't think soot will be a problem. Mine is tuned to about 220hp and 500Nm (pre facelift model, so originally 184hp and 410Nm) and even in kickdown I can't notice any soot coming out.