Thanks RRPhil.

I was wondering about the swap due to the heavy towing duty my X sees (hard on the TC/friction discs).

I guess the higher RPM/lock up characteristics of the 4.6is unit would not do well with the 4.4 M62.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!