I have an Audi A6 Avant 2.5 TDI C4 AAT model the 115bhp

I was wondering if all you need to convert to the AEL model was the fuel pump, the ecu and the gearbox and if these items are a straight swap as looking to buy the bits and fit them to make it the 140 bhp version then chip it up to 170 or 180.

Cheers,
Kieron