Glad to see you are back on the Road Again..I doubt the positioning cause the damage..What i can figure..is that he aimed it backwards...which would cuase..the nitrous to enter the engine first..and than the fuel...or your fuel solenoid..might not have opened..and that's why you detonated..lots of nitrous..and no fuel..is a bad combination..you mentioned..you had one solenoid fail on you!
But 4inches away from the TB is what is called for!
yes, but it was so close it didn't allow for a good mixture before it all went into the combustion chamber, he also had it aimed into the TB, right at cylinder 4.