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Just went through this with a friend we put the spring loaded pressure relief valve on his SM tunnel ram, get one of these it will save you money in the long run!
Bill

This is a waste of money. A serious nitrous backfire will blow the carbs off and take the top off a tunnel ram. What good is a few quarter sized holes going to do to prevent that.

The fact that he sprayed the nitrous into a non running engine is not an issue. Simple fix, pull the coil wire, open the carb and spin it over a few times, problem gone. Nitrous is not the problem, nor is it dangerous. Improper use and lack of knowledge is the problem or danger. Nitrous gets a bad rap for most of the problems that are self inflicted. A leaky solenoid is not a problem either, unless the bottle is left on, which it should NEVER be, if the car is not running, or you don't have a ball valve. If you don't know much about nitrous, get some help from someone who does.

Monte