If you buy every little piece from the dealership it can get up to probably 10k, but many of the pieces that are 'different' between the Nismo & coupe are really just cut differently.
It has been found some of the pieces on the coupe or 1 piece where the nismo in is 2, so it works just have to fit it properly. The major costs that Nissan screws people on when converting are the Nismo undertray (but now we have Zspeed) and any 'extra' bolt or plastic pieces they say are needed.
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