Turbo failing, when to replace?

Which car do you have? I understand the fuel quality in India is poor 92 ron? In the uk we run our petrols on 95-99 ron, im not sure if diesel is a similar story...

It's a Octy II 1.9 PDi Diesel and I'm not very sure of the grade of Diesel here, will try to find out now.

I agree with the other chap here.

Leave the paper one in, it's best at stopping fine dust.

If you want to keep it performing well, just replace the paper one more often, rather than fitting a filter that flows more.

Think about it, if it flows more when dirty, then the path through it must be easier.

Easier path = higher risk of nasty fine dust in there.

That actually makes a lot of sense, thanks for the suggestion, I will stick on to my stock paper filter then.