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Our DDR Performance Dynamic Throttle Body Spacer increases performance by upto 8WHP at the top-end of your Chevy or GMC Sierra, Silverado, Yukon or Tahoe's performance. Made out of 6082-T6 CNC Machined Aluminum, our spacers guarantee an overall increase in horsepower and torque numbers and an increase in airflow by 4% by channeling air flow more efficiently.