Dorch Engineering N55 DS25 HPFP Upgrade

The Dorch DS25 ("Dorch Stage 2.5") is the high-output upgrade for the N55's high-pressure fuel pump — on FlexFuel, the stock HPFP is the fuel-delivery ceiling. The 250-bar DS25 supports up to ~530 WHP on E85 standalone (more with Dorch's lift kits), eliminating the pump as the limit on a Stage 2+ build. It is not a simple drop-in: a supporting software flash (MHD, bootmod3, or custom) is required. IMPORTANT: the DS25 requires the 2013+ Bosch HPFP and is NOT compatible with 2011–2012 N55s. Select the correct adapter harness by production date (DE-55-25A for pre-12/2013, DE-55-25B for 12/2013+).