I realise that its very much underpowered & has no pick or sustainable speed
ratio as compared to Honda City, also due to very poor fuel economy i had to install CNG & now it drives like a truck in terms of speed & pick
. Somone suggested me to install "two pin spark plugs(i am not sure about the correct name of it)" , can you guys advise me about these plugs, i mean are they OK or damage the engine and/or is there also any other way of enhancing the engine performance. i am also changing the Oil at 3000km instead of recommended 5000km from Toyota Islamabad.