So I picked up an E model head pipe over the winter on ebay for $20 bucks shipped. I had read a little about the install, sounded fairly straight forward. Other guys had talked about taking in the stock muffler to an exhaust shop and getting the header opening expanded to accomodate the bigger header. I did this and it cracked the pipe So the next day I took it elsewhere, had them cut off the cracked portion and weld a piece on to fit the E header. Went fairly well, pretty ugly weld though. Once I ground and painted it not too bad. Finally get to take it for a ride:banana: A little disapointing, maybe I was expecting too much because I can't really say I notice a difference. I recently installed an FCR39 and it gave a nice boost, but the header, again no noticable increase. For anyone who has installed the E header with the stock muffler have you noticed a difference? I do wonder if the jetting has a big impact? I jetted to Eddies specs but for an aftermarket muffler. Eddie said 160main with current set up and 165 main with the KXF250 muffler I had planned to put on (wasn't as easy as I hoped) So I have the 165 main in. Bike seems to run fine but will I notice a power increase dropping to the 160 main? Is this why the E header didn't have the desired effect. Or as said before am I expecting too much?