I have a '98 Cobra and am interested in changing the exhaust system. But, unlike many others, I'm not into a loud system, and would like better performance, without the loud sound. I'd appreciate any opinions and recommendations, in response to this post. Note that I will NOT put on a Magnaflow system, due to personal reasons. On the other hand, I may be able to get a super deal on a Borla cat back system or possibly Flowmaster. But, I'm not tied to these two. I'd appreciate any recommendations for a quieter, high-performance system. Thanks in advance.