Sound is aggressive but not extreme so that it is perfect both for race track and road. A valve simulator is included in the box to simulate the presence of the original valve which is eliminated. Spark valve simulator prevents the error light from switching on. Specific diameters and tapers allow to highly improve performance without modifying map or original ECU. Incredible weight saving (-3,7 kg compared to the original). COMPATIBLE WITH THE ORIGINAL PASSENGER FOOTREST THE BRACKET TO REMOVE THE PASSENGER FOOTREST IS INCLUDED IN THE KIT