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You don't really have to lower compression for N20. But the key for big shots is forged pistons and the right tunning. Unless you are talking about 250hp shots and bigger the compression can stay stock unless you have 10.2 or higher. It's not like turbo where you have hot air being forced into the cylinders, so there is less possiblity for det. But propert tunning is an abosolute must for nitrous, running it lean one time with a fairly big shot will retire the motor! If you don't feel you are capable of tunning the nitrous then have a shop do it and don't change it.
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