I absolutely love this app! The sounds are nice, the visuals astounding, etc! And now, you have DUCATI BIKES! Insane! Keep up the good work!
Engine suggestions (with sounds);
Bugatti Veyron W16
Lamborghini Aventador V12
Subaru Impreza Boxer 4
2013 Ferrari F1 V8 (18,000 RPM REDLINE)
2014 Ferrari F1 V6 (15,000 RPM REDLINE)
Lamborghini Huracan V10
Jeremy_12 4 about Trans4motor - Engine Simulator