Because nasal vowels are non-contrastive phonemically does not mean they are absent phonetically. The language appears to be slowly moving towards developing a phonemic nasality contrast. These include:

• /a u/ + cluster of nasal and stop, or /a u/ + word-final nasal (esp. in the suffix /-on/), having optional release as [ã ũ]
• /eŋ/ word-finally in isolation being released as [ẽ]
• /o/ + cluster of nasal and stop, or /o/ + word-final nasal (esp. in the suffix /-on/), being released variously as [ɔ̃] or [õ]

So far, /i/ has mostly resisted this trend toward nasal allophony.

Syllable-final /ŋ/ may be replaced by the nasalisation of the preceding vowel (dialectal feature).

however, in the more formal speech, the contrast between oral and nasal vowels exists, as a result of the disfixing process on an ending nasal consonant.