I love the benefits of gearing, it definitely will make the car feel different.
However, the cost involved in swapping gears from one gearbox to another is a bit much, not knowing if you are going to get what you want out of it.
The cheaper option is to change the size of your tires which is basically the same. I am playing with that on my RAV4 but for all out acceleration instead, and I am doing it with tire size.
Just a thought.
My drinking team has a racing problem!!