Yes, it will work. None of the exhaust vendors sell specific 'ix' and 'i' exhaust so it should be fine. I installed the 'is' exhaust on my 335i...love the sound especially since I also installed AR DPs. Install is very simple, cut and clamp. The only problem is the tips stick out too far so I'm going to have to change the tips. I think the 335is bumper & diffuser are a bit longer versus the 335i & ix. I just need to figure out if I have to cut and weld, or if the black tips just pull off, but this will have to wait for Spring.