Stock muffler here... the different Pitts out ther ewill reduce performance... some more than others.

I stick to the stock whenever I can for th weight and performance gain.

Guys... I simply wouldn't throw numbers out there for the sake of doing so. I try to tell it like it is.

Now I did have a DA50 without the carb block mod that got nearly 500 less RPM than my buddy, same prop (literally)... it also didn't have the properly hardened pin in the rod.

I sent it in for the free upgrades and haven't run it yet... soon I hope.

I was talking to Dave a couple days ago... he said that they were pushing the 6000 mark on # of DA50's out there. That's a ton.