I didn't want to have to take my bumper off either... i've sort of come to grips with the fact that i'm going to have to to get the max amount of power I want.
You can look at the R2C intakes however, they are VERY nice and you don't have to take your bumper off... on a G37 on the dyno they are neck and neck with the G3's and in the mid range even produce more power. I happen to believe that the G37 would produce more power because the top of the bumper is very open where with the 370z it's open down bottom. Just my opinion though.
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