1.)Try liqui moly engine oil 5w-40 in ur car.I'm using in mine..The engine is very smooth and the sound is reduced.Change oil at 10k.Use large sized filter as u will change oil at 10k thats why.
2.)Avoid bad quality fuel and never let ur car knock by using pathetic quality fuel in pakistan.So,to avoid this problem use atleast 30% high octane and 70% normal fuel.If you cant afford high octane then buy STP "octane booster" (250/-RS) and use with a full tank.I had used liqui moly "octane plus" and STP "octane booster".I found STP more responsive than liqui moly.
3.)Use denso iridium spark plugs.(you can contact @jz (The pw member).He had original spark plugs).You will feel the difference in throttle response,fuel consumption.
4.)Cover your car with dust cover to maintain its paint quality.As constant dust will rough your car's paint and ultimately u will have to go for compound polish.(It maybe sound's silly but its the fact).