If you want the single pipe black chrome tips, they're available to retrofit, it's part 18302218603. They're also included with the performance muffler for the 35i as well, part: 18302166934.

If you want the dual pipe black chrome for the 50i, they're part number: 18307639891. They comes standard on the 50i with the M Performance Package (ZMX), full exhaust system part number: 18307639892.

Had to do a ton of research on this trying to figure out what exhaust was supposed to come on my 35i with ZMX.