Formula style tunnel boats have been released and are now included for free in Design it, Drive it : Speedboats!
http://www.youtube.com/watch?v=5c61WcnVwec
In the usual spirit of Design it, Drive it : Speedboats, you're free to modify the new tunnel boat as you see fit in much the same way you've been able to do with the vee bottom hulls.
Speaking of vee bottom hulls, after driver safety concerns were raised by many players, the driver has received a helmet too. This along with the new engine model gives the vee bottoms a more racey look that we hope you'll like!
Special thanks go to US Formula 1 boat owner and driver Morgan Williams of Bluewater Racing F1 for providing a new engine, new helmet, and billboard 3D models as well as providing constant feedback on the performance and feel of the new default tunnel boat. You can check him out on Facebook here: https://www.facebook.com/bluewaterracing/
Have fun!