you wont find a jdm spec r for less than 2500... you can find h22's "all day" for 700...b16 or gsr tranny another 700... mount kit would be another 700...
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walk all over a bseries for maybe cheaper or maybe a little bit more.... you just wont get the high rev...but you will def get the power and the torque.

throw some h23 internals in it some mild cams, a good ns racing street tune and your good to fucking go.