Baleno is a great car.
here is what needed to do and your car will be a Ferrari. (I have done these on my 2005 Baleno Sport)
1) Castrol Havoline Formula oil (SGP Oil Filter) "Better than Guard Oil filter" Rs 2200
2) Bosch 4 pin spark plugs. (A drastic change in sound, milage and start) Rs 1200 approx for 4 plug set
3) Seiwa Plug ignition cables Rs. 1000 approx
4) Change the boots of your ignition coils. Rs 1100 approx
5) clean all electronic switches with WD-40 and dry them with cotton clothe. Rs. 200 for small aerosol.
6) Change Air filter with SGP air filter and make sure its sealed properly. Rs. 390
Get em all from a reputable Suzuki after market parts shop.
Do these and get back to me.