i personally wouldn't refund it or anything. if it was a few weeks old or a month then yes, but a year, no way. if it worked fine on your car, no reason why it shouldn't work on his.
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2 plus 2 times 2 = ? ... hint, it's not 8 
Stillen CBE, Stillen Gen 3, TP's, Uprev tuned - 324whp/264tq
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