Fuel economy: Injen CAI versus OEM air box

By 5teve-0 | June 24, 2010 | Category 2005 Acura RSX Type S

I’ve recently removed my Injen cold air intake system (CAI) and noticed a drastic increase in fuel economy. Mind you, with the OEM air box back in, no more VTEC roar at 5.5k RPM or audible air suction sound. Matter of fact, you can’t hear VTEC engagement at all unless you turn off the stereo […]

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