Member jgood and I installed only a X pipe on his 2002 4.4 last night. The change is completely noticeable. IMO it's just the right amount of change. I have heard a 4.4 in a 7 series with the rear muffler delete, and it sounded like a old chevy farm truck.

I personally think a X pipe AND the rear delete, will be excessively loud.

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Pro motocrosser since 2005. First time BMW owner.
2002 4.4 E53