Sounds to me like the stock tune was rich enough to mask a lean out condition with your Nos.
The new tune is probably slightly leaner & correct mind you, & now you have knock.
You need to get to the root of the problem & correct the knock situation.
Have you mapped the AFR's when you fire the Nos etc.
Surely its just Fuel & timing.
If anything, it sounds like the tune is stopping your engine Grenading.
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08 Skyline 370GT SP Coupe 5AT: Diy TT
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