I use google translator from Croatian to English, so I would ask a question and apologize to the whole story.
My dad own Mazda 6, 2006 2.0, 89kw diesel, it's about 150,000km long. I bought same Mazda 6, 2007, diesel, 2.0, 89kw
JMZGG14T681719990 , same as his but, hatchback "sport" (Bose, black piano plastic..) version. Under the hood is all the same. Mileage of my car is around 180000.
When I sit in his car, I turn on the car, the whole car is quiet, the sound comes straight from the middle where the engine is - quietly! Seeing his engine from outside, there are some small vibrations, but nothing is heard or feel in the car, the cabin is very quiet!
For me, when I sit in my car, it stinks, and the sound of engene is sorround. I hear the sound from all sides. Auspuh checked, correct. The sound comes from the engine, from the floor, everywhere. When I listen to these two cars from the outside, it sounds almost the same, only with me the motor shakes stronger than it is.
The engine shakes at work, sound transmits to the body. Closed EGR, cleaned MAF, MAP, new oil, air filter.. The rear and driver bracket is new, "replaceable", not OEM, hydraulically purchased used OEM. No leak. Hard stress/shake transmited to body when turn on, no transmited vibration when turn off. RPM is ok, stabile, drive fine.
Every idea is welcome, especially those that I can "fix" myself.
Some video of my car:

 

(BUMP?)


I bought LIQUI MOLY DIESEL 500ml Diesel Purge.
Can somebody explain me in more detail which pipes I should put in a liquid container, since on youtube all the videos are related to a different car model?
Can I just put the "feed" from the filter into an additive bowl? Is there a pre-filter pump that does not spray fuel during the procedure?
Thank you.

 

 

Is it possible I hear in the cabin Exhaust Manifield?
If there is a leak, would not it smoke under the hail and there would be some other symptoms?