Review on 🚀 Airaid PowerAid Throttle Body Spacer (400-591) - Enhance Your Vehicle's Performance and Turbocharge its Throttle Response by Justin Spence

Bought for my 1997 Ford Expedition 5.4 liter engine and overall not impressed. No noticeable difference in acceleration (even at low torque). Makes a half hiss/hiss at 1/4 throttle, which sounds cool. Paired this with a cold K&N air intake and it was a pain in the rear to align later. After moving everything too far forward I had to remove the K&N entirely and make some adjustments so it doesn't rub on the fan shroud and match the metal box and rattle (which it still does since it's at an odd angle now is).