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On my 640d, the pipe size is 71mm.
I changed them for 73mm in, 101mm out tips
(ignore the masking tape - been looking a diffuser replacements)
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IG: project540ix
G30 540i xDrive / Stage 3 via BM3 / xHP Stage 3 / Pure 800 Cast Turbo / 5" Catted Downpipe / MST Intake / Remus Exhaust / MSS Springs / 19" JR SL01 & Conti SC7 / 20" BBS CI-R & Michelin PS4S / F90 Sway Bars & Braces / Lots of Gloss Black |