ISR Performance High Flow Cat - Nissan 370Z/ Infiniti G37

The ISR Performance High Flow Cats for the 370Z and G37 replace the restrictive factory cats with a 300-cell metallic substrate setup. Less restriction than stock for power gains, retains the factory O2 sensor location for plug-and-play install, and adds a more aggressive exhaust tone in the process. Bolts up to OEM or aftermarket exhausts that follow OEM spec.

What It Does

Stock 370Z and G37 cats restrict exhaust flow noticeably, particularly once you've added an aftermarket catback. Swapping to 300-cell metallic substrate high-flow cats opens up the exhaust path while still providing meaningful catalytic activity. The spun metallic substrate handles heat cycling better than ceramic alternatives. Mandrel bends throughout, fully TIG welded construction, and the factory O2 sensor location is preserved.

Fitment

Nissan 370Z and Infiniti G37 with VHR motors. Will fit HR-motor variants as long as you're using OEM headers OR an aftermarket header with the OEM-style flange type and location. If you've changed header flange geometry, these cats won't bolt up. Use OEM-specs aftermarket exhausts on the downstream side. For the older 350Z / G35 (VQ35DE non-HR) high flow cats, see IS-HFC-Z33.

What's in the Box

• 2x stainless steel high flow cats
• 2x 2-bolt exhaust gaskets
• 2x 3-bolt exhaust gaskets
• 10x hardware (bolts and nuts)

Product Details

Brand: ISR Performance

Part Number: IS-HFC-Z34

Type: High flow catalytic converters (pair)

Vehicle Fitment: Nissan 370Z, Infiniti G37

Engine Compatibility: VHR engines; HR engines with OEM headers or OEM-flange aftermarket headers

Material: Stainless steel housing

Substrate: 300-cell spun metallic

Construction: TIG welded, true mandrel bends

O2 Sensor: Retains factory location

Older Z33 Variant: IS-HFC-Z33 (350Z/G35 VQ35DE non-HR)

Sold: Pair (with gaskets and hardware)

Legality: Off-road and competition use only