Gen3's are definitely a higher HP as well as TQ gainer over the R2C's. You might not find many reviews here on the370, but coming from the G market, the R2C's were very big about 2 years ago.
There are multiple review threads over on myg37, and in the end, the Gen3's came out on top over and over again over the RC2's. The R2C's are more of a sound maker then anything. They do open up more air to the engine, but without a tune you will actually lose power. My buddy ran a before and after dyno with his RC2's and he lost about 7 peak HP and 4 lbs/tq.
The Gen3's on the other hand gain in every aspect of the map. Midrange, and especially at peak. This isn't necessarily a result of "cold air" as so many people get hyped up on, but its a direct result of how the Gen3's are engineered. They lean out the motor, "tricking" the ECU. Is this safe? Some beg to differ, but no one has ever had any issues with their engines from it, only great gains which get even better with a proper tune.
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