OK, I'm back!!
And found the pics of the crash last year.
Also have some info.

I tested the 12x4 prop on my TT with the stock muffler and with the Tower Muffler.

TT - 12x4 - Stock muffler = 12.400 rpms
TT - 12x4 - Tower Hobbies muffler = 12.900 rpms

Although a weird thing happened. After testing the TH muffler i turned the engine off. Tried it again and i spent about an hour and a half without bein able to start the engine again.
Not sure if i floded the engine, but got tired and went home. What i did so far i put the engine apart and cleaned it. What i've noticed is that there was gas inside the muffler and inside the engine istelf. I'm going to try again after it's cleaned. The plug was fine.
Prior to the test though I did freaked out when my prop spinner spined in the wrong direction. Anyways after that it started ok, but this was before i ran the test.

Do not enjoy the pictures
[link]http://picasaweb.google.com/eferraros/Twist[/link]