@WCC: I missed to answer your question earlier, just noticed, regarding what CNG setup I have in Mehran.
Its a 50WaterLiter after market CNG tank, EKC probably. I have a box placed above this tank, its the so called basstube for Mehran with CNG. I will try and post pics soon with a pair of original 718s hooked to Pioneer 2950 MP3 player via AudioBank 2040 2-channel AMP.