As long as IK/KH/Q/W/T16/20L (Original 1.1mm) once is gapped to 0.8mm => more power and performance can be expected (immediate effect after installed).
Measurement of plug gapping to 0.8mm will be shown to buyer during order collection.
'For ur info, my 'working hour' car is a mutated wira, outside 'ori' (prevent police kacau) but inside, a VR4 engine with TURBO (up to 4 bar) which able to 'boost' a healthy 400HP++...but i preset the turbo 'active'...