Are there STOL kits manufactured for Piper Cubs ?

Was flying with a friend today and his plane's high altitude short field performance sucks. Scared the bejeezuz out of me.
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@ Aurora - if you don't know, please don't answer --- thank you. Now remove your answer YAHOO does !!!!
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@ Aurora - if you don't know, please don't answer --- thank you. Now remove your answer BEFORE YAHOO does !!!!
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