This Stage 3 bucketless LPFP upgrade is for BMW E-chassis N54 and N55 engines already running a Stage 2 bucketless setup. It adds a second Walbro 450 LPH pump (F90000274) in parallel, with custom billet mounting plate, full harness and E85-compatible filter.
Plug-and-play secondary module - no cutting or splicing required
Ready for E30-E85 blends; optional upgrade to Walbro 525 LPH (F90000285)
No re-tuning needed for basic fitment; works with existing Stage 2 configurations
Avoid running below 1/8 tank during hard acceleration or track use
Not a bolt-on OEM replacement - this is a purpose-built fuel system upgrade for fast-road or track-day N54/N55 builds that have outgrown single-pump capacity.
