The easiest would be to use a short piece of 6" flex to make the slight bend; a few inches will add little restriction and will provide some vibration isolation also. If you use the type with smooth interior it won't add much turbulence either.

Option two would be to try to find a fernco sized for SDR pipe, although I'm not sure it will flex 11 degrees.

Option three would be to bend a piece of straight pipe by heating it carefully with a heat gun. Not too hard to do, but may take a couple tries to do it without kinks. It's a fine line between soft enough to bend and too soft. You have to heat a fairly wide area to get a smooth bend.