STILLEN 503436 Hi-Flow Catalytic Converters - 07-09 350Z / 370Z / 07-08 G35 Sedan / 08-13 G37 / 14 Q60 (Pair) Metallic Catalytic Converters - Pair; Stainless Steel Construction - Spun Metallic Core Bolt-On Installation - Flanged for OEM Fitment Performance Increase of 9-10 whp / 8 lb/ft **Not For Sale In California**