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as noted before...they tend to blow out under boost but i assume the previous post was a typo and should be 12 psi boost. mine held to about 14. the std bosch plat's do better than the +4 in a turbo. i use denso iridiums. change them every couple of years. but i stay under 12 psi these days. still nice plugs though. 12$ each. i think it is worth it for the extended service interval ala my amsoil dual oil filter. turbos use things up. the cost is the more but the labor is 25%. it evens out.
posted by 63.229.4...
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