DO it mate, but ask for a map with your torque capped at something sensible like 280lb ft if you plan on keeping the original clutch!
My car put down 302 lb ft on the dyno at Powerstation, but the operator said there was a fair bit more, it just never hit the rollers as the clutch was slipping in 5th gear
. Graham (celtic) reckons its more like 320-330 lb ft in a big spike. he can have it capped at whatever you like to preserve your drivetrain.
In 2nd gear the car is silly rapid, in 3rd the steering still fights you with the torque steer