korax123 Posted August 22, 2008 Report Share Posted August 22, 2008 First look at where the engine sucks air in from (intake). It a really really really small opening. Secondly there are 2 mufflers on the 4cyl one in the middle (acting as a resonator i guess) and one at the end. And last there are COPPER spark plugs in the 4cyl. And the recommended interval for changing them is 30k miles. As far as I know copper plugs are used to reduce heat and knock on an engine. Meaning they burn the fuel less efficiantly. If I didn't have the 7 year bumper to bumper and lifetime powertrain warrenty I would modify the intake and take out the middle muffler and put a resonator there. And then put some good old NGK platinium spark plugs in there. On a side note I drove 75 miles with 5 people and luggage and the 4cyl performed adiquite @ 75mph. But that lil 4cyl is pretty noisy but I will live with it. Quote Link to comment Share on other sites More sharing options...
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