as much as you decide to lay down really
If a $35 texi is an issue funds wise, don't worry about looking to hard into any form of serious motorsport including drifting. They are all really hard on your car, and require heaps of maintenance between outings, not to mention entry fees, travel to and from venues, fuel etc.
Just get out and give some motorkhanas and maybe hillclimbs a go - they are designed to be quick, cheap and fun for normal people with normal budgets.
And then if you win lotto you can build a carbonfibre bodied r35 for time attack