THanks for your help! So you do not have to do any port changes at all? They are good to go stock. What muffler have you found works best? He is not for sure what plane he has and I have not seen it. He said it is 18 plus pounds with a Qadra 41 and a bunch of lead on the tail. He got it at a swap meet. So the total cost of the motor would be around $420.00 ? OR would you use a different motor to start with. Again thanks for all the help !!