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      02-05-2013, 01:40 PM   #2
FormulaMMM
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Drives: E90 M3
Join Date: Oct 2011
Location: Midwest

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If I'm reading you correctly, the test pipes have been in since you've had the issue.

Lower gears, 2-3k rpm, directly under the car. Sounds exhaust related to me (primary cat delete). Have you checked the test pipe connections? Even if they're sound seems some vibration could emanate from them. I just installed Akra Evo this past weekend after running only an axle back -- noticing all kinds of interesting sounds, resonance, and perhaps some vibration after cat delete. Nothing quite as consistent as you report though.
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DCT E90 M3: Akrapovic Evolution, KW Clubsport, Stoptech ST-40 Front + Pagid RS29 | Stock Rear + Stoptech SP, Apex ARC-8 + Hankook Ventus S1 noble2 275/35/18 (street), Apex EC-7 18x10 ET25 + Nitto NT01 275/35/18 (track), tbd...
Past: Velos Designwerks Tune, Megan Racing Catback, Macht Schnell Filter