the 2047 i would use on a high bite track, it gives a bit more snap on the low end compared to the 086, the 086 is a great pipe, it offers good bottom end feel but is smooth, good for less grip track, but is still good on high bite with a .25, what kind of feel are you wanting, more bottom less bottom or more mid to top or all top, or linier, thats a smooth transition from bottom to top.