The cars run very rich. If they have been driven a bit, it is probably the reason why. They are lazy and haven't cleaned them probably... >_>

 

I just picked up mine yesterday (after 3 months wait! fianally) with 28 km on the odometer.
It already had that black carbon buildup on the tail pipe.
Everyone has the same issue because the car is just designed that way. No need to worry

 

my cai and fmic definately leaned me out alot.

mine gets black now after about 4-5 days!!! and even then, not even close to as bad as when i was stock!

 

That's good to hear.

Guess I'll be buying one soon then.