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Heavier Spring & Larger Diaphragm: Keeps wastegate valve seated longer which improves power
these springs will reduce or eliminate axle wrap
Backspace: 4
Heavy Tow (+40 rwhp)
Sinister Diesel Anodized Thermostat Housing 99.5-03 Ford 7.3L Powerstroke FPE-34564 Heavier Spring & Larger Diaphragm:The factory t stat housing on your 7. 3L has been known to both crack as well as not properly seal upon reinstallation after replacing the thermostat. This direct replacement from Sinister is built from billet aluminum, featuring a cool anodized blue finish, meaning it is a great upgrade for a failed stock housing.
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