If you simply want something quiet that is less restrictive than the stock muffler, Bisson offers both a wraparound and inverted style muffler. I use the inverted one on my Zenoah G23 (converted to EI) and it runs 9100+ rpm on a 17x6APC. You should get close to that rpm on an 18x6 or 17x8 once your G26 fully breaks in. My G23 picked up 1200 rpm from when it was new on that same prop!