Plane is World Models 80" Extra weighing 16.5 pounds. Engine is G62 with C&H Synchrospark ignition. Running 40:1 mix with 87octane fuel and flying at 6000' above sea level. Turning a Menz Ultra 22-10 at 7100RPM +/-

I'm moving up to higher ground and will have to fly at 8500' now.

Could anyone recommend a tuned pipe for this engine? I don't want it to be completely radical and ruin my transition or midrange. I just want something to boost performance and compensate for the altitude at 8500'. I'd be happy if I could just keep from loosing any RPM. I want to continue using this Menz Ultra 22-10 prop as it seems to be the right prop for my plane and type of flying that I do.

I have tried to look for KS pipes, but no luck here using the search function.