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40mm is also smaller than the inducer size of a 14B compressor wheel. 18psi with that restrictor in front of the turbo is not going to flow like a 16G at 18psi would normally be able to. 3" I/C piping is going to be way overkill for that turbo even with if their wasn't a restrictor, but the restrictor is just going to make it even worse. The stock throttle body matches up perfectly with 2.5" OD I/C piping. Most of the piping kits out there are only 2.25" which is more than enough for a 16G.
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