MagnaFlow California CARB Front Radiator-Side Catalytic Converter - Nissan Maxima / Altima 3.5L 2016-2021

The MagnaFlow 6511128 is a California Grade, CARB-compliant direct-fit front (radiator-side, Bank 2) catalytic converter for the 3.5L V6. It is built from 16-gauge 409 stainless steel with mandrel-bent tubing, and a single laser fusion weld reduces the chance of a leak while the compact, low-mass design improves thermal efficiency. OE-style 410 stainless barbed hangers and 308 stainless MIG welds add durability, and the flange gasket, nine bolts, and nine nuts needed for installation are included for a bolt-in fit with no cutting or welding. It is CARB compliant and legal for sale and use in California and CARB states on the listed vehicles.

Specifications

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy