The TB spacer has been proven to be very ineffective. In theory it keeps heat off your TB because the coolant doesn't run into the TB. In reality the TB is in the engine bay and normal driving (except highway) your TB will be heatsoaked being in the engine bay. Plus..so liittle coolant runs into the TB that it doesn't heat it up. If anything a TB spacer causes more problems via coolant leaking into the engine than any other mod.