I ran G3's on my G37, you don't feel any benefit unless you are flooring the car and you pass 4600 rpm. Right now I have the mishimoto intake hoses and K&N filters. It cost me a total of $198 vs. $575. I'm happier with the hose setup. You get a slight increase in peddle response which is definately welcomed. A subtle boost in power in low rpm's. You actually lose power with the G3 down low. And a modest gain in the middle to high revs. The G3 will give you a stronger boost up high but... add an exhaust and tune with the hose and filters. I think the overall power delivery will yield more realistic use of power vs low rev power loss and higher rev power boost.
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