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I have an 03 with the Sct x3. I have been running it on extreme street for over a year with stock head bolts. Boosting 32 psi....no issues
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2003 ford f-250 fx4 PSD 6 speed extended cab long box
4" MBRP cool duals
Sct X3 with custom tunes from ID
Autometer phantom 2 pyrometer and boost gauges
2.5" lift on 35's 
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