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Discussion Starter #1
Assuming you've already bought the Urethane to do this mod:
http://forum.mazda6club.com/suspension-brakes/376721-front-control-arm-bushing-urethane-mod-awesome.html

Then all you need is 8 cents to mod the Engine rear mount to stiffen it up.

Step 1: Follow corksports and/or Mazda Service Manual directions for removal of the factory mount. Jack the car and USE JACK STANDS!!! under the control arm mounts behind the front wheels.

Step 2: Clean the factory motor mount where the urethane is to be applied with Rubbing Alcohol and paper towels and cotton swabs.

Step 3: Fill all voids in the factory motor mount with Urethane.

Step 4 Insert pennies into urethane where the voids are/were, being somewhat careful to center them though the thickness of the mount

Step 5: Apply extra Urethane to cover up the pennies on the side they were pushed in from

Step 6: Clean off excess Urethane with Acetone and paper towels.

Step 7: Bring mount into house to let dry for 12-24 hours.

Step 8: Reinstall is reverse of removal
 

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Discussion Starter #3
Well about as much as it makes the driveline feel stiffer and better, it increases NVH. It isn't for everyone.

I think the best route money no object, would be to go 180 degrees the opposite of this by buying the corksport mount and cutting out a slit on either side of the main hole like the factory mount. That makes the mount resistance more progressive rate, soften the small vibrations like idle and transitioning between the engine driving and being back driven and even mild lugging (which are pretty in you face after this mod) yet gets real stiff real quick for heavier loads like shifting and being heavy on the gas just due to the higher durometer/stiffness of the corksport bushing over stock.
 
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