Differences between GTI and R engine

Cylinder head (made from a different alloy compared to other engines in this module because of higher thermal stress) Exhaust valves (hollow, higher Ni content, nitrided) Exhaust valve seat rings (improved temperature stability and wear resistance) Exhaust camshaft (adapted valve timings) Compression ratio 9.3:1 with different pistons Piston cooling jets (higher flow rate) High pressure injectors (even higher flow rate) Exhaust turbocharger Charge pressures of up to 17.4 PSI (1.2 bar) High performance main radiator with 1-2 auxiliary radiators (depending on country specifications) Additional acoustic modifications have been made in order to achieve a sporty sound - use of a sound actuator (for the occupant cell) and active exhaust flaps in the exhaust system