I've noticed that a BO1O5, fitted with 2 x 250-C30s and Superlifter blades is being promoted as the most powerfull heli of its type for aerial camerawork.
Google says engine mod was originally done for EMS work at altitude.
http://www.facebook.com/cineronsystems
Any chance of 2 x C30s squeezing into a AS355?
Would the gearbox be the weakest link?
Mickjoebill