Nice Write-up!
I have the UUC Red Poly and I agree with your NVH findings. It is a noticeable change in cabin noise level. Since my car is not a daily driver and is used for autoX and "spirited weekend driving", I find the noise tolerable. The noise kicks in around ~3k RPMs and then the AFE intake chimes in around ~5k. Together its quite the orchestra, next is the exhaust...
Wait, what? The car has a radio? Who knew....