HKS: Catalyzer Nissan S13/14/15, R32/33/34 Usually if you have a higher output, you will have low purification performance. But HKS catalyzer has both high output capacity and still has high purification performance. HKS catalyzer is 150 cells which make it less pressure for exhaust air thus produce higher output. Also the thickness of the fin to 0.1mm let it have better heat-resisting property.