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Your G26 will hit much higher rpm as it run in. My G26 on the SS is on Abell Muffler. Noisy like heck but on fly, it sounded real. Also the power gain is nice.

Now on APC 18x6W, it will hit 8300 rpm. With APC 18x8, its at 7800. This is what I fly now. I was on APC17x8 for a while. Faster with lesser thrust. Then the 18x6W, good thrust and spool up but limited power/speed. The 18x8 is much better as it allow a tad more speed.