Review on Airaid 400 633 PowerAid Throttle Spacer by Rick Everett

I bought this in addition to a K&N air intake and Flowmaster Delta 50. I did the same setup (no Flowmaster) on my last car (2009 Jeep Wrangler) and had good results. . When I added these items to my 'new Ford' I was pleasantly surprised at the improvement. "Whistle" is almost gone, but there is power. The low torque generated by the spacer and the high suction power are a perfect match for the Flowmaster. The truck sounds powerful but not mean, and I saw fuel economy increase from 14.8 to 17mpg in the first 600 miles.