FITMENT: Please Use "Amazon Confirmed Fit" Above to Verify Fitment Before Purchasing. Compatible with 2001-2003 325i Base 2.5L, 2000 323Ci Base 2.5L, 1999-2000 323i Base 2.5L, 1999 323is Base 2.5L, 2001-2006 325Ci Base 2.5L, 2001-2005 325xi Base 2.5L, 2000 328Ci Base 2.8L, 1999-2000 328i Base 2.8L, 1999 328is Base 2.8L, 2001-2005 330xi Base 3.0L, 2001-2003 330Ci Base 3.0L, 2001-2003 330i Base 3.0L OE NUMBER: Replacement #11727553056, 11721435364, 11727553056, 11727553056, 11721435364， 721852240, E034-AS, 721852020, 721852080, 721852430, 7.21852.24.0, 33-2100M, 306-024, 11521435365 100% STRICT QUALITY CONTROL: All of YZHIDIANF Secondary Air Pump Undergo Strict Quality Control Not Just Before Shipping But Throughout The Production Process. During Each Step Of Production Multiple Quality Control Checks are Performed to Insure Each and Every Part Lasts for Years to Come PROFESSIONAL AFTER-SALES: Please C-O-N-T-A-C-T us if you encounter any problem, we have a dedicated after-sales team and engineers, and have 30 years of experience in the Auto Parts Industry, so please rest assured to b-uy BUY WITH CONFIDENCE: 2 Year Unlimited-Mileage Quality Guarantee. We extremely value your satisfaction and strive to provide you good shopping experience ENHANCED ENGINE PERFORMANCE: Improve engine efficiency and optimize combustion with YZHIDIANF Secondary Air IMPROVED FUEL ECONOMY: By ensuring efficient fuel combustion, YZHIDIANF Secondary Air Pump can contribute to better mileage. Help reduce harmful exhaust emissions by effectively injecting fresh air into the exhaust system LONGEVITY AND DURABILITY: Built to withstand the demanding conditions of engine operation, YZHIDIANF Secondary Air Pump is designed for long-lasting performance and reliability QUIET OPERATION: YZHIDIANF Secondary Air Pump operates smoothly and quietly, minimizing any noise disruptions during vehicle operation ENHANCED PERFORMANCE IN COLD WEATHER: YZHIDIANF Secondary Air Pump helps with cold starts, ensuring quick warm-up and optimal performance even in chilly conditions BRAND: YZHIDIANF OE: 11727553056, 11721435364, 11727553056, 11727553056, 11721435364, 721852240, E034-AS, 721852020, 721852080, 721852430, 7.21852.24.0, 33-2100M, 306-024,11521435365 FITMENT: For:-BMW 2000 For:-BMW 323Ci Base 2.5L L6 - Gas 1999-2000 For:-BMW 323i Base 2.5L L6 - Gas 1999 For:-BMW 323is Base 2.5L L6 - Gas 2001-2006 For:-BMW 325Ci Base 2.5L L6 - Gas 2001-2005 For:-BMW 325xi Base 2.5L L6 - Gas 2001-2003 For:-BMW 325i Base 2.5L L6 - Gas 2000 For:-BMW 328Ci Base 2.8L L6 - Gas 1999-2000 For:-BMW 328i Base 2.8L L6 - Gas 1999 For:-BMW 328is Base 2.8L L6 - Gas 2001-2005 For:-BMW 330xi Base 3.0L L6 - Gas 2001-2003 For:-BMW 330Ci Base 3.0L L6 - Gas 2001-2003 For:-BMW 330i Base 3.0L L6 - Gas