I disagree with the comment above about needing to follow with 'than'. It could simply be a sentence on its own, having followed a previous sentence:  Have you seen Toyota's car model? Our model is faster, better and stronger'

I also want to note about the Oxford comma. You can say 'Faster, better, and stronger' OR 'faster, better and stronger'. Both are fine, although the extra comma in the first one (oxford comma) leads to less confusion in some situations, which I can explain more clearly if anybody cares

I agree with Andy, there is nothing wrong with saying 'faster, better, and stronger.' If you do not provide a direct comparison e.g. 'our car model is faster, better, and stronger than its closest competitor' then there will be an implied comparison with all of the category i.e. 'our car model is faster, better, and stronger' (than all the others). It's common to see this type of phrasing in advertising e.g. 'come and see us for cars that are better, faster, and stronger', or 'for a faster and stronger car choose Ford'.

P.S. Amr I would advise against using 'gonna' in writen communication (aside from sms). In my experience it is unusual to see native english speakers write 'gonna' unless they are being super casual.

@Aegis I can't comment on the UK but in Australia it's pretty common to hear cars described as strong as a synonym for powerful.

There is nothing wrong with that sentence. I hear very similar phases on TV everyday, it is acceptable to just leave that as a sentence itself.

The most common mistake I see is learners writing the word "gonna." "Gonna" is not a word, it is never ever written unless you are quoting someone else. Regardless of what people teach learners, "gonna" isn't the casual way to write "going to." It is only a common slur in causal speech. Only used when speaking.

Our new car model is faster, better, and stronger than the old one. :)

Do you mean it with a comparison? ('coz you're using comparative adjective)

I hope it's correct. Anyone can correct me if I am wrong. :)

ONLY FOR SMART PEOPLE!!!! not persons