Yeah. once people get a retune they say the cars are much better. The thing that sucks is theres only a few good tuners for these cars.
Delicious Tuning out of Cali seems to be the guys to goto. They apparently have done all of the Ken Block gymkhana cars and a lot of the formula D cars from out west.
Here's one they did with a 70mm pulley, 3" exhaust and a 4.56 gear(stock is 4.10) on e85