hi people im new to audis.

iv got a 1998 audi a4 tdi with an ahu 90 bhp engine which is dead,so im in need of a replacement,now there seems to be so many varienst of the tdi engine i dont no which ones i can use,i have found a few 110 bhp engines but not many ahu 90 bhp engines,

now what i would like to know is what engine can i use?can i use a 110 bhp engine on my loom etc? or what is needed to fit an engine not the same as mine?loom ecu?will it all bolt in ok with regards to my ancileries?

i just dont want to buy an engine to find out i cant fit it

cheers in advance

deek