OS 55AX and Ducted Pipe Rossi more RPM or just is a dream .............
I have a Bobcat 52 with an OS 55 with a Ducted Pipe Rossi and I need to tuned this combo.
The original RPM with the stock exaust was 13,000 RPM (The propeller is APC 11x7 pusher), after put the Ducted Pipe Rossi the RPM was the same (13,000 rpm), and them I would need to tuned this combo, but I don't know How to do this?
A friend talked me about, I would cut the header to find more rpm, but I want to be sure.
Could you help me?