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WIRC RACING INS-BOX Set for 1/8 and 1/10 on road cars. Super light weight EFRA APPROVED with number of homologation INS202301. The INS-BOX is made of light weight ABS, color black. The sponge is low profile to reduce the total height of the ins-box. The air inlet is made by 2 holes and then air passes through the “turbo effect” and goes into the carburetor with more speed and more pressure. This increase of air pressure makes the top speed increace up to 2km/h, more constant carburetor setting and more torque.