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AIRAID 400-590

AIRAID Throttle Body Spacer
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4.5 out of 5 stars 2 Customer Reviews
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List Price: $167.69
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$134.15 USD


The AIRAID 400-590 fits some Ford Expedition, Ford F150, and Ford F150 Heritage models. See vehicle applications for details.
The POWERAID Throttle Body Spacer is designed to enhance off-idle torque from 800 rpm to approximately 3,000 rpm. The spacer utilizes it’s unique, patented Helix Bore design to spin the incoming air charge as it passes through the throttle body spacer. The spinning air action boosts the velocity of the incoming air and contributes to better atomization of the air/fuel mixture as the air charge enters the combustion chamber. The end result is more part-throttle torque and improved mid-range power.

[More Information on POWERAID Throttle Body Spacers]
  • Made from aircraft quality billet 6061-T6 aluminum
  • Improves low end torque and throttle response
  • Gaskets, hardware and precision brackets are included
  • Installs in less than 1 hour
  • No drilling or cutting required
  • Provides stronger mid-range power

Part 400-590 Product Specifications

Product StyleAIRAID PowerAid
CARB EO NumberD-609
Street Legal In All US StatesSee Vehicle Applications
TUV Approved (Europe)No
Weight1.1 lb (0.5 kg)
Product Box Height9.75 in (248 mm)
Product Box Length6 in (152 mm)
Product Box Width1.5 in (38 mm)
Gaskets IncludedYes
Material UsedAluminum
Mounting Hardware IncludedYes
Thickness1 in (25 mm)
Warranty12 Months - 24,000 Miles
WARNING: Cancer and reproductive

Product Reviews

January 2, 2017 - Part 400-590
I have had my AIRAID throttle body spacer for a month now and have had no problems. Saw improvements with my throttle response, low end torque, and fuel efficiency.

Thunder Bay, Canada
March 28, 2016 - Part 400-590
The AIRAID Throttle Spacer, is good looking, and a fun Whistler at certain rpm's. Can't really say much more yet...I let y'all know about fuel economy, if any, I tell ya soon... D.

   Review part 400-590