Nice work,

They're good numbers with a factory muffler. I'm sure with the Ultrathrust you'd beat the OS and then it would be an apples to apples comparison.

That muffler looks fairly short and squat which tends to favour higher rpms.

I'm a fan of OS and Webra's. I had a Webra .50GT which pulled really good numbers with a 10x6 running straight fuel with 20% castor and no nitro. I sold it to a clubmate who wanted it for racing. I tried to buy it back off him a few weeks ago and he said it's too good to give up.

I'm about to buy a Webra .91 P-5 today. I've been wanting one for a while and now that i can finally get one i'm looking forward to playing with it.