Just stumbled across something... not bigger injectors, but better designed.

Mustangs Fuel Injectors Are Awsome! - Bimmerforums - The Ultimate BMW Forum

Digging around in the link at the bottom of the first post I found ones that will work for my M62tu in the 4.6is, but don't see any for the M54 engine... only the M52. Looks ilke you're still out of luck unfortunately.

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