MagnaFlow 452030 California Manifold-Cat 2001-2005 Honda Civic 1.7L DX GX HX LX

Vehicle Fitment

• 2001-2005 Honda Civic DX (1.7L I4 - D17A1)
• 2001-2005 Honda Civic GX (1.7L I4 - D17A6, CNG)
• 2001-2005 Honda Civic HX (1.7L I4 - D17A6)
• 2001-2005 Honda Civic LX (1.7L I4 - D17A1)

Fitment Notes

• For DX, GX, HX, and LX trims only - the EX model uses a different engine and requires a separate part number.
• California Grade CARB Compliant under Executive Order D-193-116 - legal for sale and installation in all 50 states including California, Colorado, New York, and Maine.
• Installation is permitted only if the vehicle's Engine Family Number (EFN) appears in CARB Executive Order D-193-116. Verify the underhood emissions sticker before installation.
• Interchanges with OE part numbers 18160-PLM-A00, 18160-PLM-A50, and 18160-PMS-A00.
• Direct bolt-on installation - no cutting or welding required.

Features

• California Grade CARB Compliant manifold-catalytic converter - certified under CARB Executive Order D-193-116 for legal use in all 50 states.
• Integrated exhaust manifold and catalytic converter in a single direct-fit assembly - replaces both components at once for a streamlined installation.
• Spun body design with free-flowing mandrel-bent 16 gauge 409 stainless steel tubing replicates OE manifold geometry and flow dynamics.
• Single laser fusion weld on the spun body greatly reduces the possibility of exhaust leaks.
• Vibration-reducing flex-pipe and precisely shaped manifold-to-cylinder head flange ensure OEM-like fitment and long-term durability.
• OEM-like O2 port locations maintain proper sensor placement for reliable OBDII compliance.
• 3D scan-based development ensures exact fitment for a straightforward DIY installation.
• All required installation hardware included in the box.

Specifications

• Part Number: 452030
• Type: Exhaust Manifold with Integrated Catalytic Converter (Manifold-Cat)
• Series: California Grade CARB Compliant Direct-Fit
• CARB Executive Order: D-193-116
• Emissions Compliance: CARB - legal in all 50 states
• Body Material: 409 Stainless Steel (16 gauge)
• Body Type: Spun
• Substrate Material: Ceramic
• OE Interchange: 18160-PLM-A00, 18160-PLM-A50, 18160-PMS-A00
• Fitment Type: Direct-Fit (Specific)

Included Components

• 1x California Grade CARB Compliant Manifold Catalytic Converter
• 1x Donut Gasket
• 1x Flange Gasket
• 2x Nuts

Product Description

The MagnaFlow 452030 is a California Grade CARB Compliant direct-fit exhaust manifold with integrated catalytic converter engineered specifically for the 2001-2005 Honda Civic DX, GX, HX, and LX equipped with the 1.7L I4 (D17-series) engine. Certified under CARB Executive Order D-193-116, this manifold-cat is legal for sale and installation in all 50 states - including California, Colorado, New York, and Maine - making it the ideal replacement for Civic owners in any state. Developed using MagnaFlow's 3D scanning metrology process, it replicates the OE spun body manifold design for a direct bolt-on installation with no cutting or welding required.

The spun stainless steel body with single laser fusion weld, integrated flex-pipe, and precisely machined cylinder head flange delivers a leak-resistant, vibration-damping assembly that maintains OE-like exhaust flow and proper O2 sensor placement. All required hardware - including donut gasket, flange gasket, and nuts - is included. Note that installation is permitted only if the vehicle's Engine Family Number (EFN) appears in CARB EO D-193-116 - verify the underhood emissions label before purchase. The EX Civic trim uses a different manifold-cat assembly and requires a separate part number.