@wasay
thanx bro
i have changed its air intake now,previous one was blocked and was in bad condition,now bought in silver colour,brand is "sakura"(made in thailand)
currently there is no blockage,will go for cng setting,hope it works without blockage,currently doing well and giving an average of about 100kms/cylinder
and checked its 0-60 timings and it was about 8 seconds even with 17"rims,weight of cng cylinder,2 woofers etc so i guess its all doing well,will get to its maintenance soon 
thank u