So I made an SRI, that I converted to a CAI then back because I liked the feel of the SRI better. No CELs or anything. Plus with my scan gauge running, The airflow difference throughout the rev range is about 4-5kPa. I don't know what measurable power difference it made but the car is easier to drive off the line and feels like it's revving quicker. I'll try to remember to post my DIY write-up later.