It sounds like the cop is a jerk but the law is on his side, when issuing the "Fix it" ticket.
I have a police friend, who says that they can pretty much fine most things modified from OEM on a vehicle but usually let it pass unless the driver is an a$$.
I've just learnt to drive carefully around cops with my Meisterschaft exhaust.
'01 M3 Cab. (gone) '04 Maserati Coupe Cambiocorsa (gone) '08 S550 (gone) '07 550i (gone) '07 911S (gone) '08 M5 (gone)
'10 M3 Alpine White - DCT(gone) 2012 Porsche 911S