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hi there
i am new to nissan's and i just got a 91 nx and am going to be racing it at a local oval track. just curious what i can do to the motor to get some more power. keep in mind that it has to appear stock so no headers,cai etc. i was wondering if these cars computors can be reprogramed or do i have to replace it and if so what is a good company to use? what size fuel injector do these motors come with and can they be bored out to flow a little better or are they good enough for minor upgrades. also what are the stock spring rates for these cars as i have not taken it apart to rate them yet. any help that anyone has for me is greatly appreciated thanks.
 
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