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A shop local to me (now out of business) did LSx swaps into a handful of 3 series, anything from coupes to wagons. I considered the same thing when I had to replace the engine in my 7...the pushrod V8 is so much smaller its not even funny.
What engine is in your X? It seems 3.0's has the most issue with drone, the 4.4 being the ideal engine for exhaust mods. I did Magnaflow 14816's on the 7 and they sound awesome, but they're too long for use in the X. X-pipe or those a pair of those eBay $16 mufflers that E53X54.4 used seem to give good results.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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