Is the MagnaFlow 23941 legal in California?

No. It is federal/EPA compliant, not CARB approved, so it cannot be sold or installed for emissions use in California and other CARB states. Check your state's rules before ordering.

Does it fit my car without welding?

It is a direct-fit part designed to bolt to the factory flanges with the included gaskets and hangers. Confirm your exact year, make, model and engine in MagnaFlow's fitment guide first, since the 23941 covers specific applications only.

One converter, a crush ring gasket, a donut gasket and exhaust hangers. You supply the tools.

Why did my check engine light come back with P0420?

P0420 means the rear O2 sensor sees the converter not cleaning exhaust efficiently. Causes include an exhaust leak at the flanges, a failing sensor or a converter that has degraded; diagnose before replacing parts.

Will it make my car louder or add power?

Most owners notice a slightly deeper tone and little to no power gain. It is a replacement converter, not a performance upgrade.

How does it compare with a universal-fit converter?

The 23941 is vehicle-specific with pre-formed tubing and flanges, so it usually installs faster than a universal weld-in unit. Universal converters are cheaper but need cutting, welding and custom mounting.

MagnaFlow 23941 Large Stainless Steel Price History: Lowest $811.99

Q: Where is the MagnaFlow 23941 Large Stainless Steel Direct Fit Catalytic Converter cheapest?

At Advance Auto Parts, for $811.99, as of our latest check.

Q: What do buyers say about the MagnaFlow 23941 Large Stainless Steel Direct Fit Catalytic Converter?

Buyers like: Easy to install; Lightweight; Increases power. Common complaints: Difficult to install; No increase in performance.

What reviewers say

Reception is mixed. Many owners call it an easy, well-fitting bolt-on with a good sound and solid build, but a notable share report installation headaches, non-OE flanges and P0420 codes appearing within a year.

What people mention

InstallationMixedSome owners bolt it on without trouble, while others call it difficult and cite flange and O2 sensor fitment work.
Catalyst efficiencyCriticisedSeveral report a P0420 code within about 10,000 miles, meaning the converter stopped cleaning exhaust efficiently.
Build qualityMixedStainless construction and the single weld are praised, but the flanges are called inferior to the original equipment.
SoundMixedSome like the deeper tone; others find it noisy compared with stock.
FitmentMixedThe 3D-scanned body fits well for most, but the side-mounted O2 sensor bung can require heat shield or floor modification.
PerformanceMixedA few owners report more power, but others say there is no gain over the factory unit.

From Advance Auto Parts

Keep the check engine light off with MagnaFlow HM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 23941
Free-flowing mandrel-bent tubing and highly corrosion resistant stainless steel construction
Easily install yourself using the proper tools, no cutting or welding required
3D scanning during R&D so the part fits and functions like the original equipment
Single laser fusion weld greatly reduces the possibility of a leak
Compact, low-mass design allows for greater thermal efficiency

Materials: Stainless steel body; high strength 16 gauge 409 stainless steel tubing; 308 stainless steel MIG welds; 410 stainless steel OE-sized barbed exhaust hangers; cer
Fit: Direct-fit, specific fit; designed to fit the 2002-2006 Acura RSX Type-S 2.0L; replicates OE design
Guarantee: 2 year warranty
Shipping: Store Pickup, Same Day Home Delivery or Home Delivery available
In the box: (1) Crush Ring Gasket, (1) Donut Gasket, Exhaust hangers included

About the MagnaFlow 23941 Large Stainless Steel Direct Fit Catalytic Converter

The MagnaFlow 23941 is a direct-fit catalytic converter with a stainless steel body. It is HM Grade and Federal/EPA compliant. It is designed to fit the 2002-2006 Acura RSX Type-S 2.0L and replicates the original equipment design.

The converter is built from 16 gauge 409 stainless steel tubing with mandrel-bent, free-flowing tubing. A single laser fusion weld reduces the possibility of a leak. The compact, low-mass design allows for greater thermal efficiency. The part was 3D scanned during development so it fits and functions like the original equipment.

Installation requires no cutting or welding and can be done with the proper tools.

Fit type: Direct-fit, vehicle specific
Vehicle: 2002-2006 Acura RSX Type-S 2.0L
Material: Stainless steel
Tubing: 16 gauge 409 stainless steel
Welds: 308 stainless steel MIG welds
Hangers: 410 stainless steel, OE-sized, barbed
Compliance: HM Grade, Federal/EPA compliant
In the box: Crush ring gasket, donut gasket, exhaust hangers

What buyers say

Buyers like

Easy to install
Lightweight
Increases power
Great sound
Durable
Fits well and performs as expected

Buyers complain about

Difficult to install
No increase in performance
Noisy
O2 sensor mounted on the side instead of top of outlet pipe, requiring floor and heat shield modification
Flanges not OE, inferior quality
Set code P0420 (catalyst efficiency below threshold) in less than a year and about 10,000 miles