ISR Performance High Flow Cat - Nissan 350Z G35 non HR

The ISR Performance High Flow Cats for the 350Z and G35 (VQ35DE, non-HR) replace the restrictive factory cats with a Magnaflow 300-cell metallic substrate setup. Less restriction, more flow, a deeper exhaust note, and the factory O2 sensor location is retained for plug-and-play installation on stock or aftermarket exhausts.

What It Does

Stock 350Z and G35 cats are a major flow restriction, particularly once you've added a Y-pipe and catback. Swapping to high-flow cats with a 300-cell metallic substrate opens up the exhaust path significantly while still providing meaningful catalytic activity. Magnaflow's metallic substrate handles heat cycling better than ceramic alternatives, and the 2.5" mandrel-bent piping ties cleanly into both OEM and aftermarket exhaust systems built to factory specs.

Fitment

Nissan 350Z and Infiniti G35 equipped with the VQ35DE engine (Non-HR). Fits both G35 Sedan and G35 Coupe, including G35x AWD sedan per ISR's confirmation. Will not fit the 350Z HR or G35 with the VQ35HR engine, which use different cat geometry. Check your engine code before ordering, and check your local emissions laws before installation.

What's Included

• 2x ISR high flow cats
• 2x 2-bolt exhaust gaskets
• 2x 3-bolt exhaust gaskets
• 2x O2 sensor extension pipes

Product Details

Brand: ISR Performance

Part Number: IS-HFC-Z33

Type: High flow catalytic converters (pair)

Vehicle Fitment: Nissan 350Z (Non-HR) and Infiniti G35 (VQ35DE), including G35x AWD sedan

Engine: VQ35DE (will NOT fit VQ35HR)

Material: Stainless steel housing

Substrate: Magnaflow 300-cell metallic

Piping Diameter: 2.5"

Construction: TIG welded, mandrel bent

O2 Sensors: Retains factory locations (extension pipes included)

Sold: Pair (one per bank)

Legality: Off-road and competition use only