N20 Going catless

[4_ring_circus]

I plan on replacing the downpipe due to a flex pipe leak with a catless one. Anyone have any luck with O2 spacers to avoid check engine light? Or is a tune the only way to go?

If there is no easy remedy for the check engine light I might consider replacing just the flex.

[Gamb1t]

You can also check with the F30 crowd since their 328i share the same n20 with our X1.

You do know that your X1 will smell right?

[4_ring_circus]

I have searched in F30 section, but came up empty handed.

I ran my A4 catless and to be honest never even noticed it smelled more/different.

[Gamb1t]

Can't comment on the A4. Apparently our N20 is tuned a bit rich. Hence the recent recall to lean out the mixture a bit to prevent cat failure.
I know the car smell of unburnt fuel during cold startup. YMMV.