[zprinsy44]

Hello!

I am in the market for a downpipe for my 2016 M235i. I obviously want to go catless, but I am worried about passing smog in California. Does anyone have a suggestion on options?

I am also planning on moving to Boston this upcoming summer. I do not know the laws and regulations there so I am not sure if I can go catless there, so if anyone is in the Boston area and has input there too, that would be great!

Thanks for your help!

[subzero05]

you will not get any shop to install a catless DP in California. big no no and fines are huge with California air resources board. I presume Boston is much the same

[nioh_lbbm2]

The best legal downpipe is the OEM one because literally nothing else is legal since nothing else will pass visual.

End of thread.

[jb-slow]

Time to move!

[zprinsy44]

Originally Posted by subzero05

you will not get any shop to install a catless DP in California. big no no and fines are huge with California air resources board. I presume Boston is much the same

even a high flow catted downpipe wont pass here? I just moved back so I'm not sure anymore

[ljason8eg]

Originally Posted by zprinsy44

even a high flow catted downpipe wont pass here? I just moved back so I'm not sure anymore

A high flow cat will still fail the visual inspection. I'm sure people sneak things like the HJS Euro 6 downpipe through because it looks damn near OEM, but no guarantees obviously.