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The B58 HPFP is only better because its volumetric efficiency is slightly better than the N55 HPFP. The XDI pump has different sized pistons... I think XDI came in to explain a lot of their engineering & design on that thread.
This doesn't mean that the XDI can be skipped, especially if you're trying to put down serious power.
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Current mods
Rockford Fosgate P3 // JBL MS-A5001 // MiniDSP
Ultra Racing Strut Brace // AFe Pro Dry S // PS2 // Custom Inlet // DV+ // FTP Boost Pipes // VRSF Race IC // VRSF Downpipe // ECUTek Protune @ 5280'
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