Multi-angle valve jobs are used to ease the flow transition from the port to the chamber on the intake side and from the chamber to the port on the exhaust side. The width, number and concentricity of these cuts influence sealing effectiveness and flow quality.
Tennys Sandgren is an American professional tennis player competing mainly on the ATP Challenger Tour both in singles and doubles. Born and raised in Gallatin, Tennessee, he went on to play two years of college tennis at the University of Tennessee before launching his professional career.
Chapter 2 is the main part where the song plays through a tennis match. This is taking place (and is also actually recorded live) at the main stadium court of the Roland Garros complex, court Philippe Chatrier. In the tennis match, Martin Solveig faces fellow DJ Bob Sinclar as an opponent.