don't know if they are recommended or not
but u can get all kinds of chemical stuff in Jap
they have this metal plates which u can place in your air filter
it suppose to ionize the Oxygen O2 blah blah and hence you are able to burn up the fuel more better. Also have air-con chemical oil etc. suppose to make your a/c like a freezer and turning on your a/c will only take away like 2% of the power.
They do work as magazine in Jap, Asia etc test them on dyno etc
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