Man! Altis on CNG!! What you have done to the beauty!! You have ruined the beautifully designed setup!! Its intake manifold will be half gone too along with the engine!!
No doubt,the car is way better than XLI, but you have treated it as XLI by converting it to CNG. There is no point of comparison between the both now.
Please share the total mileage, it will help alot to judge the condition of the engine. Moreover, if possible, please share the interior pics as well.