(VVT) system.

Porsche

Porsche introduced VarioCam Plus which added two-stage intake valve lift to its VarioCam system.

Subaru

Subaru introduced i-Active Valve Lift System (i-AVLS) on the second-generation EJ25 (EJ253) which features two-stage intake lift, however it is only used on one of the two intake valves. second-generation EZ30 uses two stage lift shims, bucket, on all intake valves.

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