Ok....
After meeting harris bahi,I concluded this:-
1)My rears 2 pair of 6X9 speakers making sound muddy in my setup,though my setup did not included any compoents or speakers on front...
2)Other factor is also that,My car is on Cng and Harris bahi car is on fuel...so the more space in trunk the more room for subs for banging up...
3)My Speakers Phatta didn't having any port though the bass can be heard in the cabin of the car...On the other hand Harris bahi car didn't having any speakers @ rear and factory designed phatta having 2 x grills for factory speaker...though which is now helping for coming bass in cabin of the harris bahi ride...
4)My pre or my subwoofers or my amp not having any problem....I checked harris bahi VMAX sub also in my ride...But the result is same,Box is also problem free....In fact Harris bahi sub began to bottoming out,Because amp is continuously feeding it 1200 RMS and sub is only 500RMS......!
Now harris bahi suggested me to add some nice components on front doors....and sell those 2 pair of 6X9...!It will also make a huge addition of bass..!(H)
So,Inshallah soon i am going to buy some good components for my setup...!