Don't waste your money !!!!!!!
You wont notice any gain on a low compression, low power thumper like the XT...
They are for very high performance race bikes where engine temperatures are very high and squeezing an extra 0.001% of efficiency is worth the extra cash.
But, if you can get them for the same price... why not !!! They should last just as long as regular platinum plugs.
Read this... Iridium spark plugs by NGK and Denso
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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