Do you think this is normal? The two exhaust pipes got very different discoloration in my RV 7 (Lycoming IO-360-M1B). One "looked" much hotter than the other. This unevenness is only at the outlet end of the pipes. Inside the cowl, the colors of the two pipes look similar. the "hotter" (darker) pipe actually looks more burned at the outlet end than inside the cowl. This puzzled me. the outlet end should be much cooler than inside the cowl due to cold air stream. The engine is running normal and smooth. EGT spread is about 60F max between cylinders. The soot inside the two pipes looks the same in terms of color and quantity. Don't know when and how this is developed, the engine got about 106 hrs since new. Is this this something I should be concerned with as long as engine parameters are within spec? What could have caused this. Looking for some ideas.