Join Date: Jan 2008
Location: Brooklyn, New York
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If you guys have searched way back, a lot of MS6 owners have had this issue. It's the passenger side engine mount. It only happens when the car is cold and goes away as the car warms up. You may not see a leak but it is broken, you can check if the bolts are tight as you want, but you will never know it's the mount. Many have asked this question and this is what I have experienced and told them.
As for the humming sound, check the wheel bearings or the shock mounts. The shock mount may have worned out and it's transferring road noise into the car. It could also be the hub/bearing...
2006 Mazdaspeed 6 sport #01820 - Whitewater Pearl 65,300 miles
COBB AP(Stage1+SF+TIH+IC 93), SRI; HKS SSQV, Denso ITV22, CS HPFP, custom FMIC, BSD w/PTP baffle, ADD W1 catch can, MF cat-back, ATP DP/vibrant performance HF cat, VP resonator, EGR delete, Sparco Ring SW w/NRG quick release hub, Sparco R100, STRI Xline Boost, OEM Clutch w/Fidanza FW, TWM stage 1, COBB shift knob, CS front strut & rear bar, Megan H-Bar, H&R coils, Whiteline RSB, Drag DR-34 18x8 et47, Falken Ziex 235-40/18.