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I haven't installed an X-pipe in my X5, and I have yet to hear one in person. There are more than enough videos on YouTube, but sometimes hearing it in person is best.
I've got Magnaflow 14816 mufflers on my 740iL and they sound amazing, but the muffler body is too long to fit in the X5's muffler area. BMWX54.4 did some nice sounding eBay mufflers, but my only concern was their fitment (not filling the opening perfectly) and if they'd eventually keep getting louder overtime as the packing material inside disintegrated.
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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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