Everyone raves about how great the 98 S70s are. I had a 98 GLT for over 10 years and loved it until the tranny went. I got a 98 non turbo and it has been a good car except for the exhaust noise. I replaced the entire system( Bosal cat and muffler) including the manifold. I even added another muffler at the end(a new muffler for a 740). Still too loud. What gives here? From what I understand, the turbo is much quieter because of the back pressure and also because it uses a cast iron manifold opposed to the stainless pipes in the non turbo.