For the modification-related query, we'd suggest you walk into the nearest authorized service centre as they will be the better person to assist you. You can click on the following link to see the details of the nearest service centre and selecting your city accordingly - Service centre
The ISUZU MUX and Toyota Innova Crysta 2.8 are two cars from different segments. The Toyota Innova Crysta 2.8 seems a better choice if you are looking for a car with better dynamics and more features. Moreover, if you are looking for an SUV with bigger dynamics, amazing features, and a high seating position, the ISUZU MUX is an amazing pick. Moreover, we would suggest you visit the nearest dealership take a test drive of both the cars so that you may evaluate the cars according to the build quality, comfort, and performance.