No problem with CEL on my Stillen HFC's. I have 2000 miles on them so far. I chose them basically I got a deal I couldnt refuse from Stillen at the time by buying thier power pack for the 370. I didnt like the sound at first but after putting some miles on the car with the new exhaust it sounds totally different now. The rasp that it used to have has now all but dissapeared. It has a very deep tone at low rpm. It definitly sounds modified.
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To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.
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