I admit I was just trying to get everyone typing, I was bored and wanted to get this thing as long as possible. I know that the .91 fx was heavier with the muffler, but Roberts responces really made my previous one look like I did know what I was talking about. I had to stand up for my 2 stroke debate, it seems like I am the only one on that side. You guys fly the heck out of those 4 strokers more power to you (less than a 2 stroke though) LOL . One of my R/C role models loves 4 strokes. I just can't get into them myself. I love to debate its great fun. No one take anything personal, I'd rather fly than argue but I have been unable to so here I am, hopefully we can all do this again soon.