The 82011 and 82015 both use same Nitrous Management Unit part# 82007-1.
The part# for a replacement solenoid for the NMU is NS6541.
There is not much room inside the NMU box and you will need some soldering skills to replace the solenoid, so I normally recommend replacing the whole unit.
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Matt Maxwell
Technical Consultant
FAST/COMP Performance Group www.fuelairspark.com
1-877-334-8355