I also have a 99 SS/SLP 6 Speed Convertible. Bought it about 10 years ago with about 20000 miles on it. Always been kept inside and never Winter driven. I added long tube Hooker headers, K&N air filter, tubular strut brace, rear control arms and Panhard rod. Then some subframe connectors, a custom sound system, oxygen sensor and skip shift eliminators and a custom tune. I have to say that it is one of the most fantastic cars I have ever owned.