Check the listing for details. YXZ 1000 Intake Air Box Spacer Up To 10H.P. Increase Alba Racing. Color: Black, Condition: New. Listed at 134.99 USD. YZX 1000 Air Box Spacer Modification - Adds up to 10 rear wheel H.P. Fits all models and all years SS and standard shift **Not for sale in California. **Requires Reflash of ECU or Fuel Controller After countless tests with different velocity stack lengths, diameters, plenum volume, and shape we are happy to introduce our NEW Airbox Spacer! the factory airbox actually works extremely well, and is very hard to improve upon without sacrificing power in the lower RPM areas. (We have been trying for a year!) With our new spacer you get the benefits of a larger plenum volume with the torque and low end HP of the stock velocity stacks! This is by far the best all around intake mod you can do. It is simple to install and still uses both factory air filters for the best filtration in any terrain. Don't spend $900+ on an airbox that sacrifices filtration for HP!!! Check out the dyno sheet picture. Stock motor with ECU reflash. 10 hp gain at 7800 RPM and 6hp gain on the top end. This is real horsepower! Features: -molded from high strength plastic. -Increase hp by up to 10hp where you need it most. -20 minute install. -Works great with stock and modified vehicles. Questions?? email us thru Ebay