Unless you have the Bosal Silencer.his sounded farty with the BOSAL, not the focussport stealth.
the high flow cat / header / flex combo WILL make your car louder. if you have the FS stealth, however, it will be much quieter than if you had the bosal / magnaflow / etc.
I have the same set up except my cat back is a diff brand and I have a flowmaster 40 series delta flow (supposedly lower note than the regular 40 series) and its not too loud...but then my last set up was the same but with no muffler. DAMN that was loud!I have the FC 4-2-1 header, FC Flex Pipe, and Borla. It's loud, but not obnoxious. It's especially loud for me because my car is gutted.