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thats the one. I did it myself in around 4 hours (took my time to orient my self to the car). The install is straightforward if you are mechanically inclined. You have to remove the right catalytic converter which has 4 nuts (the access is limited so I recommend a gear wrench). Also helps to have a 4-5 lbs rubber mallet.
Update:
The test mule is holding up well. This week (weather permitting) I will test out silicone in the plug chamber. I haven't seen much a of a different with the materials (soft foam, weather insulation, rubber, etc.) I've put into the plug as far as sound dampening.
Silicone plug:
Any updates and availability of these plugs? Thanks, Doug