Technically yes, but alas you are still thwarted by that piece being for the 3.7 which has smaller pipework than the 4.2 (55 vs 60mm), as is the AE version (FL 3.7) they also have.
The only 60mm version they appear to have is for the W12, which interestingly has an X pipe instead of an H, but is also even more eye-wateringly expensive
https://shops.audi.com/en_GB/web/tra...4d0253409ah-11
Edit: still thwarted - the W12 is 60 in and out whereas the S8 is 60 in and 55 out, and the 3.7 is 55 both sides.