ORIGINAL: rlau

I need a little help with my somethin extra, I have been flying for about two years and have 7 different planes, guess I'm addicted. I have been doing some simple 3d stuff with electrics and last summer picked up a used (10) flights, Something extra from a guy at the local club. I saw him fly it and flew great, but he needed some cash so I bought it from him. It has a TT pro .46 mounted at a 45 degree angle, a 14" tuned pipe, 2 extra inches on the rudder and he had the CG at about 4 1/2 inches back. I was not ready to have the cg that far back from the suggested 3 1/2". I pushed the battery as far forward as possible and still had to add 6 oz of weight to get the CG back to 3 1/2. That seems like a lot of weight, I'm guessing the plane is about 5.5 - 6 lbs is this normal. I thought the tuned pipe might be weighing it down it is mounted under the fuselage, could that be the problem with the CG and is the weight difference worth the extra power. Thanks Randy