I recently bought a 2005 Impreza with the 2.5 and manual trans. The original motor broke the timing belt and ruined the heads and cracked the block. I bought another 2.5 out of a 2001 Outback with auto trans. The motor ran great in the 2001 before it was pulled. I had to put the intake from my 2005 2.5 on the 2001 2.5 plus the clutch, pressure plate, and flywheel. After putting the motor in my car and running it for a few hours it started making a pecking noise. I pulled that motor back out and already found a 2.2 with on 80,000 miles on it. The 2.2 ran great in the donor car before I pulled it. I pulled it out, changed the intake, and installed my clutch, pressure plate and flywheel and a new throw out bearing and the motor went straight into my car. After running it for about 30 min. it started pecking just like the first motor I bought. I pulled the motor back out and bought a new clutch, pressure plate and flywheel. The clutch disc had a lot of play in the collar that slide onto the trans shaft. I then put the motor back in the car and it still makes a pecking noise. ANY INFORMATION AND ADVISE WILL BE GREATLY APPRECIATED! It doesn't make since that both motors wan fine in the donor cars until i installed them in my car. PLEASE HELP!