Just picked up an 09 voyager, and was wondering if putting new pipes and a PCV on it would cool it down some. I added a PCIII to my 1500 classic to clear some low rpm engine knock and definitely think it cooled the engine a little with the richer mix.
I was stuck in traffic on a cool 65-70 degree cloudy day near the ocean and I was actually sweating, the temp gauge was around 80%. Once I started moving again the heat issue was gone. I am going to talk to the local dealership, bought the bike ~250 miles away, to see if I can get them to do the heat mods if I don't get new pipes