How to gain more torque, without spending shitloads?

[dynosaur]

Using a 4.928 final drive over stock item will deliver an effective gain of 3% in usable torque.
The 3% also translates into increased rpm at a given speed in gear.
Using the above mentioned 110km/hr example,
In reality the 110km/hr cruising rpm of a STD DC2-R with 205/50/15 tyres is 3790rpm
Using a 4.928 final drive, the same cruising speed with same tyre size is achieved at 3903rpm
The math says the increase is only 113rpm - total. (@ 110km/hr)

Crazy? or Common Sense?

Will we gain some torque if JUST change the adjustable cam gear ?

thanks