Direct from Japan Honda Mfg. Co. is the JDM Civic Type R N1 spec intake manifold. Unlike the ITR, Honda realized a 60mm throttle bore opening was the optimum size compared to the 62mm openings on larger 1.8 B18C power plants.
The casting on this N1 pieces has gone through minor finishing work within the runners and has optimized runner length and plenum size for the smaller B16B/A engines.
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