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What kind of nitrous kit is it? and is it wet or dry. I would go back to the dyno and make sure your AFR is right first. If it's a wet kit, always tune the motor N/A then tune the nitrous to the motor...
Do an A/F check. If its cool and the there is no KR, spray with a wet kit. I'd say stay away from the dry kits unless you tune and run a little rich to be safe.
I think he has a wet kit. But BOWTIE why are you so freaked with dry kits??? dry hit harder, but the 5177 is very safe and with 150 shot, very pleasing also. (44 jet).