I only had mine for a month and the vent pieces yellowed really quick. What I did was just spray painted that part with a high temp paint. I also put the thermo-tec heat shield under my hood.
My hood went four years before clouding and yellowing began. There are ways to delay the yellowing, such as ceramic coating and heat insulation, but it will happen eventually. For cheaper CF, such as Seibon, Rexpeed, and JDP Engineering I would have them clear coat stripped and redone, since their QC isn't always the greatest. For Varis, APR, and Voltex I went with what I got from the factory, but it all eventually yellowed. Some of it has to do with the season in which your CF part is produced. During the rainy seasons in Asia, when the humidity is high, you're going to get variations in the clear coat that allow for clouding and yellowing faster, especially if it's a cheaper company. The same thing happens with CF production in the US. Due to this, I just make a judgement call based on my experiences with whatever manufacturer I've bought from and either re-clear or let it ride.
