Originally Posted by Togo

I think with the Injen they supply a smaller one and you just replace the oem one with the new one. Only down side being you might refill your washer fluid container more often. Also some have said they think that with the Injen they can reach the filters to remove them for cleaning without then need to remove the entire front bumper. It may be possible to get to them through the wheel wells. The Stillen Gen3 will require bumper removal.

I can't comment on the AEM.