Thought I'd post my impressions of the Corksport Transmission Motor Mount Inserts.
Installation:
Fairly easy compared to cleaning the intake valves . It should have taken about an hour or so.
The main bolt for the tranny mount was a struggle to get off, needed all the strenght I could muster using a 600mm breaker bar to get the sucker off.
The point I chose to jack up the engine was the oil pan, rear of the oil filter. I jacked it up an inch or 2. Used the standard car jack to do it. (*edit: the best place to jack from is the tranny end on one of the ribs, makes it much easier and aligns better. To do that properly you'll need to take off the 2nd undertray)
I sprayed some silicone spray to assist with the insertion of the TMM inserts into the stock mount.
On tightenining up the main bolt, i managed to shear it...bugger! Still trying to find an OEM replacement
(edit: got one from http://www.jimellismazdaparts.com/)
Couldn't get one out of mazda locally as there were none in stock and no stock showing in Mazda Japan! Anywho, I found a M12 x 60mm high tensile bolt from Masters that i've used as temp replacement. The bolt might have been defective as most of my engineering mates said I wouldnt have the strenght to shear a 12mm high tensile bolt like that (dont know whether I should feel relieved or offended lol).
Impressions:
I have noticed less torque steer and smoother shifts.
Torque steer reduction about 10 to 20% (hard to quantify without some sort of mearuring device. It didnt eliminate it the torque steer, it just reduced it). Less wheel hop as well. I noticed some minor extra vibes (5 to 10%) but that has died down (happened quite quickly). Mind you I have a JBR 88a dogbone as well (installed pre TMM inserts) which I really enjoy, dont mind the good vibes.
Overall, a good easy cheap mod to further reduce engine movement.