I want to buy a car from Suzuki through a so-called Islamic bank on installments.
However, the car price is 11 lakh but I have to pay approx 14 lakh in 5 year installments.
Is this interest or profit? Is it halal or haram?
It wouldn't be much of an Islamic bank if it were haram. There are ways to make it halal, and you can contact the bank to ask for details and some Islamic banks have fatawa declaring it halal.
The usual process is described by an AboutIslam fatwa (about houses):