I just turned 50K on my '91 90csQ20V and I notices a small exhaust hiss/leak. Although it is just the donut up front it got me wondering on when I will have to replace the whole blessed thing. Has anyone seen any leads on a stainless freeflow exhaust system for this beast? Stock seems awfully restrictive and expensive. (I doubt stainless would be cheaper, but at least it will last!) Thanks! Bob