I would very much doubt it. The psychological effect these things have is to believe your car will be quicker, hence you put your foot down more, and begin to believe it is indeed quicker. Even if the thing works, the difference, especially in a fronty, will be negligible. The money would be better spent looking after what is already under the bonnet.
Its a big 4x4, nothing is gonna make it into a ferrari.
You could always drive like miss daisy for a week, and then put the money in the tank and take it for a good thrashing to make you feel equally impressed with its new performance
