I have a 91 560 SEL with 160,000 miles and runs like a champ. The vehicle is smog exempt, so it no longer needs all the emissions systems that is probably decreasing power and fuel economy. What can I get rid of and what kind of power and fuel economy can I expect? Keep in mind I still want it to sound like a benz, not a muscle car like some people have made their benz' into. Thanks.