open box just sounds good but if anything is a power loss and allows more heat soak.
20's dont have much to do with it but consider the weight of each "chromie" as opposed to OEM or lightweight wheels and think how much harder the "S" has to work to get a rotation on them (not dramatically much but it still isnt the best to have chromies with open box on a hot day)
after u change spark plugs clean the throttle body and sensor has a big difference most probrably use ngk platinum spark plugs cost more but u can feel a big difference
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