As my title say, how can I know is the mazdaspeed wing is Genuine or copy?Anything would be notice ???

if you got it from a mazda dealership i'd say its genuine.

fitment issues.. some replicas don't have metal mounts.. and even the ones that do have a different quality metal.. also replicas are made of heavy fiberglass.. im not sure about the genuine but when you have a replica you'd have to shut the trunk slowly.. replicas also need to be sanded down really good or else the surface will not look even hope that help

reputable dealer

Send it to me. =D

throw it like a boomerang, if it's real it'll return to it's spot thrown from, if it's a replica it'll keep flying forward after you hurl it.

if its not painted - its probably fake. MS Body Parts come painted from the factory

I think you can order them without paint though.

where are you thinking of buying it from? If it's ebay, it's most likely a replica

the MS spoiler can come in primer. most replica spoilers come in carbon fiber and with cheap brackets, just make sure they're not.

or just buy from a mazdaspeed dealer.

The cost might also be an indicator.......

yeah, if it's less the $800 or so it's probably a replica

a mazdaspeed unpainted spoiler is about 600.

some replicas dont come with an adjustable bracket for the downforce changing thingo

If you can surf on it, its a replica.