Hi guys, I'm new to this site. I'm after a little advice if possible. I have bought a Audi avant 1.8t. 2003. The car has the BEX engine currently but it's buggered. I have bought an engine from my pal but it's a APU engine. He tells me this will fit. Do I need to replace or get anything sorted as don't want the car over fuelling etc....... If so please could you let me know.