2004 Toyota Corolla LE
Sound is good, not obnoxious. Loud and girthy at high rpms and still retains deep tone at lower rpms without being too loud. Instructions were straightforward, and the install wasn't bad, but would have been much easier on a lift instead of on jack stands on the street. Construction was functional and solid although the welds in some areas looked rough. Performance - I don't really notice horsepower gains, however it does feel like my little 4-cylinder can access its power more readily.