i have a peugeot 405 sri and i dont have a sunroof and i am looking forward for installing a sunroof so can any one advice me what to do??

I'm the opposite, I don't want my sunroof lol!

It would be very difficult to fit a sunroof to a non sunroof car IMO. You used to be able to buy aftermarket ones to fit, but don't know if these are still available? I know Britax used to do them

Any after market sunroof can be installed.
The factory can not be installed as it uses a beveled edge.

But make sure you use a good one, otherwise your roof will become very flexible and that is a killer for your paint.

My second 405 had a after market one, roof was terribly cracked

I once had a 405 with a 205 GTI sunroof fitted! Actually looked quite good but didn't work that well.

Scoop, can you fill in your location on your profile please.

I dont like sunroofs even though both of my 405's have them, i wouldev loved if at least one of them didnt have one.
And if your planing to race it, sunroof is a no no.