If you're getting 10 lbs thrust you're shortchanging yourself..A G26 with an 18-6 Mejzlik will pull at least 17 lbs on a spring scale..Been there, converted many, they all work the same, 8200 rpm with the stock muffler and a Mejzlik 18-6.....Try it, you'll like the extra 6 or so lbs extra thrust....