Aren't the sodium filled valves supposed to help or at least increase the resistence to heat? I know that doesn't help with everything else that is exposed to those temps.
With a standard stage 2 StreetTUNER map I was hitting 900C on some 4th and 5th gear runs. After reducing the boost into a more turbo friendly level I might see 825ish. VF39 = flame thrower.
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Dan - '05 Black WRX STi.
My Mods
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