WALKER Pre Catalytic Converter (28725) is manufactured to OEM tolerances, ensuring a direct-fit replacement that restores your vehicle to factory specification without any modification. Technical specifications — Length [mm]: 595 mm, Weight [kg]: Cast Iron, 770 kg, Code Letter: 91, Supplementary Article/Info 2: 515, Guarantee: Cast Iron — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Compatible with BMW vehicles; use the vehicle selector above to confirm exact fitment for your make, model, and engine variant. Fitment data is sourced from TecDoc, the authoritative European parts catalogue. This part supersedes original equipment references: 18307553594, 28725, 45280. Matching these numbers confirms a like-for-like replacement with no loss of function. WALKER is a recognised supplier of automotive replacement components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched with tracked delivery and a 14-day money-back guarantee with hassle-free returns.

Walker, part of the Tenneco group, is a well-established manufacturer of exhaust system components with decades of engineering experience. Walker specialises in catalytic converters, diesel particulate filters, exhaust pipes, silencers, and flexible connectors. As a supplier meeting strict European emission regulations, Walker products are designed for precise fitment and optimal exhaust gas treatment. With extensive vehicle coverage and products engineered to restore factory exhaust performance, Walker is a dependable choice for exhaust system repairs across all major European vehicle brands.