All sifu here help! My car running too rich i think, the fc is 0.25 per KM, that is rm 50 for 200km! Is it normal or its unnormal? O2 sensor problem?
Wira 1.5 gli auto 1999
Here are this list of mods i did:

1. 4-2-1 exractor ---> de-cat(replace with bullet) ----> S-flow muffler
2. oversize throttle body
3. And the rest small mod i think no effect the fc one eg. air filter and etc etc