what about the bad gas mileage. before i put the header of i was getting 21mpg but right after i put on the header it dropped down to 11 and eventually got down to where it is now-5mpg. do i need to get a fuel controller or is there something else wrong
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91 N/A automatic supra;K&N FIPK;2.5" custom exhaust;no cat;pacesetter header;eibach springs;tokico "blues";MKIV TT rims
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