5/16 Motordyne Spacer difference
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Basically, the addition of the copper piece serves to keep your throttle body relative to the ambient temperature of your engine bay as to avoid damage from temperature fluctuation. So if you'll be driving in freezing temperatures often I would recommend it. If you live in a mild climate don't worry about it.
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^i agree with what everybody else says. The one neat thing about the spacers is the top of the intake plenum never gets warm. makes me wonder if the air stays cooler inside the plenum since the temp would in theory be slightly cooler :/ I installed the isothermal one a few months after getting the G, the only downside was i had to buy the mrev2 lower plenum because i have a revup...but overall i have not had any issues, never adjusted the coolant valve in the winter but never had any issues from not doing it. love the sound it gave the motor, definitely one of the best mods for power.
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^i agree with what everybody else says. The one neat thing about the spacers is the top of the intake plenum never gets warm. makes me wonder if the air stays cooler inside the plenum since the temp would in theory be slightly cooler :/ I installed the isothermal one a few months after getting the G, the only downside was i had to buy the mrev2 lower plenum because i have a revup...but overall i have not had any issues, never adjusted the coolant valve in the winter but never had any issues from not doing it. love the sound it gave the motor, definitely one of the best mods for power.
I know for sure from Hondata's intake manifold gasket they claim a 5% hp difference, just because the prevention of heat-soak in the intake manifold.
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I drove ttrank's car solo
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G35 sedan w/ too much money in mods
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