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What to cold air injections "really" do???

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More than you may think.   Stock set-up is what the engineers designed.  Do you have an engineering degree?   ;D I have the K&N filter and run synthetic oil.  Those two simple upgrades from factory have proven to be beneficial for me.  My 03 Mach1 gets it's air from the shaker hood and from under the pax side fender.  All cold air.  I truly believe that this upgrade is beneficial to any internal combustion engine. 

the filter will help but the actual cold air setup id rather save some money and spend it elsewhere just my 2 cents


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