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I don't think my butt dyno registered an increase in power either, but I do agree that it's basically a snakeoil kind of "mod" since there is less drag on the engine. I don't think it'll add power by any means, but I'd imagine that it'll allow things to spin up easier. Also, deleting the fan clutch and plastic blades means just one less thing to worry about.
I haven't seen the Zionsville option for the E53, but it would be a nice upgrade. Like I've said though, it's interesting for me to see all the M62 problems that happened in the 5, 6, 7, 8 and M series cars finally trickling onto the X5 boards.
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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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