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Message: <blockquote data-quote="wytstang" data-source="post: 720034" data-attributes="member: 7973">The only time a mail order chip is useful to a bolt on car is when you are running long tube headers. Since they move the O2's further back it tends to read a lean condition at idle when every thing is fine. The puter will richen up the fuel mixture to compensate for it to heat the O2's back up (wasting fuel). Also our cars (if I remember correctly) pull timing during shifts for better pollution control, that can be removed via a chip. You can also change your fan settings if you like.Those small reasons are not enough *to me* to pay for a dyno secession, a mail order chip from a reputable shop can do that with out seeing the car.</blockquote>