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Well for one the 2jz has been around alot longer than the N54/N55 so the aftermarket is much more mature. Second the Supra was strictly a sports car and it's owners were far likelier to heavily modify a car the bought only for performance whereas the BMW is a sedan first and sporty car second which dilutes the "hardcore" enthusiasts %. But mainly the issue is the newness of the technology and how complicated BMW makes it to work on/modify these cars. For instance on the N54(and probably N55) the turbo is cast into the manifold making your "slap a bigger turbo on it" all the more difficult. The fact that these motors are DI is the biggest obstacle to progress due to lack of availability of parts and the difficulty in tuning the stock computer.
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