Hey Zuhaib,
I agree with ur investment vs maintenance theory. It touched my heart.
To my surprise, the senior mechanic AKA USTAD, checked my car before changing the wires and said that you wires do not seem to be problematic, its your CNG tunning, it took him 3-5 mins to re-tune the car and since then the problem is gone.
So i returned the cable wires is living happily ever after 
In addition for your body kit, yaar honestly your car seems fine but if you wanna make it unique or spice it up a little then u may go ahead with it. Talha, yeah he is cool no doubts there and his work is almost immaculate and so is the price :S
TC buddy, Adios