Quote:
Originally Posted by bmw540san
Not sure about fit.
The 3.0 exhaust tubing ID before muffler is probably smaller than 4.4 which would mean the 4.4 mufflers inlet would not bolt on 3.0 tubing outlet.
Just guessing though.
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Every X5 other than the 4.8is has the same size flange on the muffler, regardless of exhaust tubing diameter.
Fun fact: If you cut the pipes off of a late 4.4i muffler, the slide right into the tubes of a 4.8is muffler, for the easiest possible 4.8is muffler retrofit. It’s such a good fit that you could absolutely do a no weld retrofit using only clamps. (I still welded.)