If you plan or know you will be keeping the car forever, etc. than do the EGR delete. However if you are not sure and there is a chance you plan on selling the car in the future, it may be harder to sell the car or less attractive to someone especially that may live in the state that inspects or requires this. They may still want purchase your car but offer you much lower as they will need to obtain parts and labor to install it back again. Again just my opinion. God Bless :)