i have a purge kit and ive had my n2o hooked up for quite a few months now...yes i run rich. problems? none at the moment and i use my n2o quite often when the bottle is full...i also run rich aside from the n2o becuase my header fried my o2sensors and i cant afford new ones...and i dont think purging your lines clears nitrous from the manifold or intake and i have never had my car revv higher when i start it back up after a run..but i also dont shut my car off imediately after using it...but the purge kit clears the left over n2o from your lines going to the management unit at least thats how its set up with my zex kit...this is like you said to clear un used n2o from the lines so that when you spray again youre not using "old" n2o so to say..and i dont have smoke coming from the exhaust or what not so im not running too rich, rich yes but too rich no.. and yes id rather have it runnin rich than lean so im cool with the way it is now ...knock on wood
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