Has anybody seen (heard and felt) the difference between the power and mega bomb header for the WR, or any other bike for that matter? I have the TI Powercore Silencer and wanted to get a header now. But I cannot decide between the two. Price isn't really a huge difference to me, I'm more concerned with the power and sound difference. I don't want a really annoying and loud bike. Can anybody give me some input on this?