But then, I will not be able to tell how much the Injen brought, because it will be the exhaust, the mapping, and the intake added up. On the "modified weekly" YouTube channel, the guy has an Injen CAI, RBC intake manifold, and some Skunk2 exhaust on, I think it's decat , and it made 208 hp unmapped on the dyno. My personal opinion is, that instead of banging on my chest over a 2 hp gain from the Injen at peak revs, I enjoy the improved throttle response and sound more. After mapping it will probably make anything around 210. It goes for souped up NA engines in general, K20 included, that I would need to spend a stupid amount of money to see big gains.