test pipe = straight pipe no res or anything
resonated test pipes = also straight thru but with a perforated resonator to help remove rasp
HFC = not straight thru
yes test pipes reonated or not will most likely throw a CEL. mine did for 400 miles. then 200 miles later went back off????? hmmmm either way the car doesnt change anything when it throws the CEL. justa heads up for the driver.
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