I went for a ride on Monday and upon washing my bike when I got home I found this dent in my header. I don't know how it got there. I only went down once softly and it was on the left side, not the right side. Couldn't have been roost since I was leading the whole time, but nevertheless its there. I have heard of people getting the dents out by filling the header with water and freezing it. My question is, does this work with the stock header since it has that power bomb chamber? Also, is there much performance to be gained by going aftermarket? I have an FMF powercore4 pipe and had to use their reducer to mate it up to the stock header. This leads me to believe that the FMF headers may be a larger diameter? I ride primarily on the bottom end, rarely getting above 8k rpm (I know this since I have a TrailTech Voyager and it keeps track of my RPM and I can look at a map of it after the ride). Anyways, just looking for some advice before I make any decisions.