The only cons for this vehicle are the occasional high - priced repair due to the difficulty of getting to certain engine components. (autolist.com)
The exhaust system also includes a sound flap that opens at certain engine speed ranges to give the S3 a sportily sonorous sound. (ausmotive.com)
In its three - stage variable intake manifold system, gate valves automatically open and close at certain engine speeds to sustain torque over a broader rpm range. (articles.orlandosentinel.com)