I bought a 2000 9-3 that needs an engine. It has the 2.0 high pressure engine (B205R). Can I put the low pressure engine from a 99 or any other 2.0L in it. I'm assuming all the 2.0's will bolt up just a difference in accessories and the computer. Which one will bolt in the easiest besides the B205R. What will I have to change? ECU? etc.