I just tonight installed my PLP silent flow intake. The install was very easy and I did it in 15 minutes. I took it out for a spin around the block and got it up to 60. I noticed the same tone at idle and below 4000 rpm but I noticed once the RPM's started going past that, that it puts out a not loud but very pleasing growl. As for power wise, I did not drive it hard but I did not notice any gains and I was not expecting to. Once I get it tuned with SAFC and my exhaust it should make a difference. As for how it looks, I think it looks stylish with the red connectors and looks better than stock. I will post some pictures and maybe some before and after videos and sound clips in a couple of days. I hope some of you will find this review helpful. Happy holidays to the .netters and may santa bring us very nice gifts for our IS300s!!!!