i've got a competition engineering sump i want put on my gas tank and need a recommendation for a welder.the tank needs holes cut out to act as baffles and the sump has to be welded and made to fit on the bottom of the gas tank.there are no gas fumes in the tank.i've had both for a while and decided to have it done now.what would the cost of this be? also the tank's not on the car. i live in the troy area.