Due to the change in seasons here in Chicago, I decided to go from my CAI to SRI.
With my scangauge I have noted the following observations. When running my CAI, my intake air temperatures where usually the same as the outside air temp or a couple degrees over.
Now with my SRI, I have noticed quite a bit of a change. At cruising speeds, my intake temperatures are about 3-5 degrees over outside air temperature. Also in city driving with stop and go traffic, I have seen my intake air temperature go up to almost 30 degrees above outside air temperature.
So all in all if you do a lot of highway driving, you will not notice much of a difference with a SRI than a CAI. However, as soon as I did the change I did notice the difference. To me it feels a lot less responsive.