Above: Side view of Prototype muffler for Mazda rotary engine.

Above: Front view of Prototype muffler for Mazda rotary engine.

Above: Back bottom view of stainless steel exhaust system for subaru powered RAF gyro.

Above: Front view of stainless steel system for subaru powered American Auto Gyro.

Above: Side view of stainless steel system for subaru powered American Auto Gyro.