8x (+2.3mm) Triple-Groove Supertech Nitrided Exhaust Valves MINI R53 | R52 | R50 | Cooper | Cooper S | JCW

New set Supertech exhaust valve.

These Black nitride valves are an excellent choice for high-performance engines due to their enhanced durability and heat resistance. The nitriding process creates a hard, smooth surface that reduces friction, improves wear resistance, and extends valve life.

These 2.3mm larger valves improve airflow by allowing more air and fuel into the combustion chamber, boosting power output. This reduces restrictions, improves the volumetric efficiency, and enabling the engine to breathe better, especially at high RPMs.

NOTE: We advise our customers that remapping the ECU is essential when installing these valves, as they generate increased airflow. Not remapping the ECU will result in severe engine damage.

ATTENTION: These valves require triple-groove (OEM) keepers and retainers!

When upgrading to a the single-groove system?
Upgrading to a single groove valve keeper system is recommended for engines running extended periods at high RPMs, such as in circuit racing. This system offers better stability, reduced weight, and more precise valve spring control. It is less prone to wear, improving reliability and minimizing the risk of keeper slippage.

Specifications:
– Head size 25.50 (+2,3)mm
– Stem dia 5.92mm
– Length 118.37mm
– Angle 45 degree
– Keepers use OEM

Sold in a complete set of 8 pcs.

Supertech valve train components are engineered for high-performance racing applications, combining over 30 years of experience. Their valves are crafted from premium materials, undergoing precision CNC machining, specialized heat treatments, and advanced coatings. These processes enhance strength, reduce friction, and improve heat resistance, ensuring durability under extreme conditions.