Today I recived the exhaustpipes from GB. I use a compleate system produced for BOT Speed Cruiser. This have passed the German certification according noice level, with D-motor and a 3-blade propeller. Unfortunally, small difference in the motor mount design make it nessesary to use a longer primary pipes to aviod contact. The producer CKT extend the pipes 40 mm and now there is space enought.
