If you reread Post number eight where I go in on timing timing timing if I can quote myself.. and I also explain all the safety measures I put in place for the mere hundred shot that I'm using... Or I should say going to use it's not like I never will... Then and post 24 I reiterate all of that and yet again and post 25 I recommend a call to Mike thermos of nitrous supply... which I'm sure he would go about saying all kinds of good factual information. now if you'd like me to go on to page 2 page 3 and this page as well and research what I said it was never just throw a bottle in the trunk and let it rip... Done right 150 shot or less shouldn't kill almost any motor and starting at 200 or more you probably want to take some special precautions internally....