The ZF 8HP70 transmission is the same used for the 2014 Jeep SRT (formerly known as the SRT8). The Jeep has 470 hp and 465 lb. ft.
The ZF transmission in the 335i is no doubt rated lower, hence the different model number.
You have to remember that ZF builds this 8-spd. for 13 manufacturers and countless models, hence there are no doubt several different variants.
If modifying your car to become a torque monster, a manual transmission would be much easier to modify and strengthen for our cars than the automatic.
I must be the only one in the world that thinks the 335i is "fast enough" as-is.
If I wanted an M3, I would have purchased one...