Just bought a new HPS short ram, to replace my injen CAI.
No whistling, just don't want it anymore.
The car runs very different than it did with the short ram.
Best gas mileage I'm seeing is 23 average on the highway.
That's with cruise control!
The power range has changed a lot since I installed the injen. Around 4K is when the ponys kick in. This was between 2 & 3k with the SRI.
Just my two cents.
I think the SRI was a better fit, for me.