I have a 07 WR450 with stock header and FMF powercore slip-on. I saw this Delkevic titanium header (powerbomb look-a-like) on Ebay and thought it might be worth a try. Looks like the stock heat-shield fits on - definite plus. Anyone try one? It says it fits a 06 YZF which I think should fit the 07WR? If I decide to go with a stock YZF header, is there a preferred year that works best? And last, do I need to change the exhaust cam to see any difference. I'm planning on changing to YZ cams eventually, but plan on riding a while before I do it. Thanks for any input!