The 03 - 05 and the R6s doesn't have a cat.Does the 05 r6 have a cat ? Cus the 02 and 03 r6 headers don't and all u have to do is bend the pipe a little so it clears the oil pan. I fabricated my own exhaust by cutting the cat off the stock pipe and welded on a 3" pipe about 13" long and put an endcap on it. I will take pics in the morning and show u..