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Discussion Starter #1
So my 16 wrx has black stuff all around the exhaust tips and it gets black really quick. I have also noticed my mpg has gone down quite a bit. Is the engine running Rich? Does anyone else have this problem and how can I solve this?
 

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Has the car thrown any CEL?
Subarus are tuned relatively rich from factory, so some amount of soot is normal on the tailpipe, particularly if you wring the engine out frequently.

Head to your autoparts store and puchase a can of CRC MAF cleaner (I think it's the same as any electric parts cleaner, so if you have that at home use it). Remove the MAF and spray down the element from all directions. Let the MAF sensor sit for about 20 minutes, reinstall the sensor in the car and disconnect the battery leads to reset ECU learning. Reconnect the battery and start it up. See if this improves your situation.

I'm assuming the car is stock?
 

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Discussion Starter #3
yeah the car is stock other than an axle back. And no check engine lights thank god.
 
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