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If you are running boost and if you have not adjusted the Cam timings to account for boost yet then it might be better to run full DI in those areas. If you still have the huge valve overlap of the NA tune in the scavenging region then with PFI you will be shortcircuiting a lot of fuel into exhaust and engine might actually run lean. If you have already changed the timings to cut down overlap then ignore this
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