VSR E30 M3 Catalytic Converter Section

High-end performance catalytic converter center section exhaust

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The VSR E30 M3 Catalytic Converter Section is the only aftermarket center section exhaust with dual high-flow triple-action catalytic converters on the market! The mandrel bent stainless steel tubing is fully welded and designed to fit with a stock muffler or just about any aftermarket muffler. This system weighs less, flows better, meets emission standards, and has the crossovers that the S14 engine needs in order to optimize power and efficiency.

Dyno testing has shown a gain of 4-5 hp over the stock catalytic converters, but the most impressive part are the significant gain in torque at lower RPM.

VSR designed this cat section to tuck up high in the transmission tunnel for more clearance and less aerodynamic drag, and they eliminated many of the unnecessary bends and the power robbing crushed section under the rear suspension. All this for a price very close to half the factory replacement section! 

 - 2-piece construction, fits 1987-1991 E30 M3 only. 
 - Dual high-flow triple-action catalytic converters
 - Fits stock and most aftermarket mufflers
 - Less weight and better performance than factory units
 - Much more affordable than OE replacements

Catalytic converters rarely fail on their own. In most cases, another issue has caused the catalytic material to be contaminated, overheated, or damaged, leading to failure. The most typical failure comes from a failed primary/front O2 sensor, which cause the engine to run rich (reducing fuel economy), which also melts the catalyst. Replacing your failed catalyst without solving the root cause of failure will void any warranty and significantly reduce lifespan of the replacement catalyst. It is the customer's responsibility to diagnose and determine the root cause of a catalyst-related engine code. Before spending thousands of dollars on a new catalytic converter, make sure you have considered and investigated all other potential sources for your fault codes - oxygen (O2) sensors, cooling system, intake or exhaust leaks, fuel injection, vacuum, secondary air system, and other emissions-related equipment. Returns of this product are limited to quality and workmanship issues only.

Federal vs California Spec. Catalytic converters must be matched to the vehicle build specification and/or the region where it will be used. Using a non-California cat on a California-spec car will result in failure of emissions inspection and possibly even poor drivability, fault codes, and a check engine light for incompatible parts. Your vehicle spec can be found on an emissions label on the underside of your hood. California-spec cats are more expensive but have premium catalytic material and a longer warranty.
California: you must use a California-spec cat. A California-spec cat can be used in all 50 states, regardless of original spec.
Colorado, Maine, or New York: state law requires a CARB-certified cat for all new sales beginning January 1, 2023, regardless if the car was built as a “California version” or not. The previous "OEM grade" will no longer be accepted in these states.
All other states (Federal): the “Federal” spec is acceptable, however, using a non-California cat on a California-spec car may cause poor drivability, fault codes, and a check engine light for incompatible parts.

BMW Fitments:
3 Series
E30 (84-91) > M3
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