Performance Stages
Stage 1 Stage 2 Stage 3 Stage 4 Stage 5
Intake Porting Yes Yes Yes Yes Yes
Exhaust Porting Semi Semi Semi Semi Semi
Combustion Chamber Reshape No Yes Yes Yes Yes
Flap Delete Kit Required Required Required Required Required
Replace Intake Valve Seats with AMPCO 45 No No No No Yes (+1.0 mm)
Replace Exhaust Valve Seats with AMPCO 45 No No Yes (+1.0mm) Yes (+2.0mm) Yes (+2.0 mm)
Valve Guide with Stopper + Extra Lift + Valve Sealing Optional Optional Optional Optional Optional

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