I see people saying that build lower compression engines and spray to get the HP you want. Well just what does Nitrous do? It raises cylinder pressure ......what is the difference?????? What is the first thing that must be done to use Nitrous? You HAVE to RETARD the timing. In my opinion timing is the single largest contributor to detonation. You can detonate an engine just as bad with an 11-1 motor as you can an 13-1 and use the same gas due to timing. You cannot run the same timing at 11-1 that you can at 13-1. On the same motor. Matter of fact you WILL slow down by switching to racing gas if you have your 11-1 tuned properly. I hear people saying that their 10-1 engines will not run on pump gas. Well give me your 10-1 engine and I will save 4.00 a gallon and probably run faster.