well I'm not 100% on that but many posts and things I've seen state that the 1j is a tougher motor(can handle more boost from factory) and being a only Japanese produced motor they tend to keep the beer things for themselves such as rb20,25,26 and sr20 and so on.... I have seem built 7mgte's that can make 1000hp but as far as hear say goes 1j's can make it easier(more expensive) of course but this is my project car not my daily so I'm willing to put time to build it right
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