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I am importing a 85 200ZR from japan and am gonna be running it as my go-fast car. I just want to take it to the track, drags etc not really anything on the street. I want the car to have some serious power behind it. I have NO experience with nissan engines.

What kind of power can I get out of the RB20DET(Red cover) without doing everything custom made? I am thinking about taking the RB25DET "neo" from a R34 are the "neo" engines worth the extra money if im gonna be modding?

What kind of power can both engines make?

How do the gearbox's from the cars compare in terms of size? Will a RB25DET gearbox from a R34 go on without major work?

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rb20det will be good for around 260rwkw (but its alot of hardwork to get there) rb25det ive seen people make 400+ rwkw with that it just depends on wat mods u have mate, neo engines are good but its a hassel , my advice spend extra 2grand and get urself a GTR engine, easily done up and power increases like a mofo

If you're going ab RB20 then you really want a silvertop out of an R32, they're a nicer engine than either of the redtop variants from the R31.

If you want serious power, then an RB26 or an RB30 twin cam is your route

Depends on what you define as serious power really

The RB20DET is already in the car as it came stock. I define serious power as around 700HP at the engine or 400RWKW. More is always better

As I understand it I won't be able to buy a RB26 halfcut as the gearbox will be an AWD unit while my car is RWD. Is the RB26 really worth the extra money or will the RB25 just not hold togther?

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