For those looking to increase the power output of their 2000-2005 BMW E46, Radium Engineering offers a plug and play (bolt-in) solution for the most popular fuel pumps currently available on the market.
This kit features a 6061-T6 CNC billet aluminum sleeve that slides over the corresponding pump to mimic the larger diameter BMW fuel pump. The machined "rib" locks and properly locates the filter sock in the BMW hanger assembly. The sleeve includes a laser etched logo. For protection, the sleeve is then anodized in order to resist alcohol (E85, ethanol, methanol) corrosion.
The selectable pumps include Walbro 255lph (GSS341 and GSS342), AEM 50-1000 Gas, AEM 50-1200 E85, Aeromotive 340R Stealth, Deatschwerks DW300, Walbro 400lph Gas, and Walbro 400lph E85. The economical Walbro 255lph is a proven OEM fuel pump that is arguably the most popular pump ever. The aftermarket AEM 320lph (Gas), AEM 320lph (E85), Aeromotive 340R Stealth, and Deatschwerks DW300 320lph fuel pumps flow ~25% more and are direct replacements for the Walbro 255lph. However, the AEM 320lph (E85) has been upgraded to resist all fuel types including alcohol blends such as methanol and E85 fuels. The Walbro 400 OEM fuel pump has a larger base, but is quieter and can outflow the previously mentioned pumps. The Walbro E85 is similar to the Walbro 400 but can also withstand flex fuel ethanol blends and outflows all others (430lph at 40psi).