Made as a one piece forged valve for higher strength and reliability, Supertech use mostly EV8 (21-4N) for Intake and Exhaust valves but there are other alloys that we use along with different heat treatments to manufacture valves for different applications.
 
0.8mm larger than OE
 
Please note these valves require the use of Supertech valve locks which are included with the valves and its price. 
 
Fits
Peugeot 208 GTi (All Models)
Citroen DS3 Performance
Citroen DS3 Racing
Peugeot 308 GTi II
Peugeot 308 GT 205
Peugeot 308 GTi I
Peugeot RCZ
Peugeot RCZ-R
Mini Cooper S (R56)
Mini JCW