Nissan GTRs / RB26 - increase maximum upgrade

Has anyone ever wondered why in fh5 the rb26 is underpowered compared to the 2jz in the mk4 supra. Yhe supra can have the twin turbos swapped for a single, but the rb26 is stuck with the twins.

Also the rb26 can only make up to 800hp, whereas the 2jz can make 1600hp. Is forza choosing favourites?

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