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I agree with TypeRNammer, I personally feel that performing an NA build on a D-series is a waste of money relative to the power gains it will result in; I think that 1. the motor in question cannot squeeze out that much power under an NA build (I'm not sure if you're suggesting you want to make 170-180 to the flywheel or to the ground, but either way, I don't think it's possible), 2. for the amount of money that you'll put into this NA d-series build, you will be disappointed with the results, and especially 3. if you are already planning to dissect and dismantle the motor to perform this build, it would be extremely wasteful both financially and with time. You're going to dismantle your motor and replace your existing parts with aftermarket parts, you might as well replace them with forged internals to support a forced induction application. All in all, I think that for the money you will spend on the forced induction route, relative to the performance gains (i.e. both in horsepower and torque), you will be much more satisfied. I realize that, of course, everyone has a budget and perhaps forced induction is too pricey but I'm merely pointing out that for the money you will have to put in for the NA D-series build, you will not be satisfied with the output and a achievement of 170-180 HP is probably not possible. Personally, I also feel that either performing a B-series swap (i.e. from a ITR or GSR) or building your D-series for boost are better options which will fulfill your power/ output requirements more realistically. Good luck with your build!
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