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When I was picking up new plugs for the Sportage November '11, the counter had the Denso TTs on display, it's a neat looking plug, and looked very similar to the NGK Platinum V-Power plugs I ended up purchasing.
I don't remember the exact pricing, but they were in the same ballpark as the NGK plugs..
Design-wise, the Denso TT did have a slightly wider shoulder gap on it, vs. the NGK.
I too was questioning the 'disc' portion of the electrode, whether it was formed in, vs. added: with the platinum cladding, I couldn't tell.
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