exhaust turning bumper black and yellow...Running Rich or Catayltic delete the cause?
03-06-2010, 03:28 PM
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exhaust turning bumper black and yellow...Running Rich or Catayltic delete the cause? my exhaust turning my bumper black and yellow....smells like it running rich but the company who dyno tuned the car says that its because i have no catayltic converters is the cause of the bumper turning black....anybody know what the cause is?
03-06-2010, 04:14 PM
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They are correct, the exhaust will smell like that any time you don't have cats. As for the bumper, I've had that same problem (black, never yellow) with an ORY before. It wasn't excessive, but it definitely did leave some black soot on the bumper that I'd have to remove every so often with rubbing compound. You can stop this issue with turndown style tips.
03-06-2010, 08:13 PM
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Yellow, I'd pin on the !cats. Black is going to come
regardless. My tips (CME soot-billboards) always got
black before I ditched the cats but it was a dry soot.
After the cats came off, it's "gummier" (I'm calling it
heavy HC fractions in the mix).
regardless. My tips (CME soot-billboards) always got
black before I ditched the cats but it was a dry soot.
After the cats came off, it's "gummier" (I'm calling it
heavy HC fractions in the mix).
