ausubaru92 Posted June 29, 2005 Share Posted June 29, 2005 I saw somewhere that running an EFI car without a Cat will decrease the MPG Is this true? Gannon Quote Link to comment Share on other sites More sharing options...
idosubaru Posted June 29, 2005 Share Posted June 29, 2005 different cars could likely see different results. for the ER27 (same motor as EA82 except 2 more cylinder) i saw no decrease in mileage without a cat, with a cat and with a high flow converter, i've had all different combinations. i saw a 2 - 3 mile per gallon increase in highway mileage when i replaced the stock muffler with a dynomax straight through muffler. i drive 30,000 - 40,000 miles per year highway miles. around town driving may not have the same results. Quote Link to comment Share on other sites More sharing options...
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