Everyone says this is the best one to purchase. On their website they have 3 different one's: basic, isothermal, and copper isothermal. So which one do most of you buy, and which one is the better bargain?

 

Not to be too rude.. but it obviously says what the differences are on the site..

 

Motordyne marketing is straight forward. Read the information, and make a decision based on your needs.

 

I agree with the others. Motordyne is very good with their product descriptions.

First, any of the three MD 5/16" spacers will give you the same performance effect from the spacer, ie all the spacers are the same.

Second, the only reason to use the Isothermal or Coppper Iso-thermal kit is to attempt to keep your upper and lower plenum cooler. Colder air is denser air. Denser air has more O2. More O2 means better combustion. Being in a warm climate, this may be quite useful for you.

Third, the difference between the Copper Iso-thermal and the regular Iso-Thermal is in the routing of the engine coolant. The Copper Iso-thermal routes engine coolant through a copper section that transfers heat to the throttle body, keeping it from freezing in cold weather but thermally isolating the upper and lower plenum. The Iso-thermal kit has a valve that simply allows you to close the coolant line to the upper plenum entirely. If it is going to be cold, open the valve. If it is warm, close the valve. Note the section of the MD information for the Iso-Thermal kit:
So, make your choice.

 

Copper if live in cold area.

Iso-thermal thermal gasket/coolant valve (for live in hot area).

Basic without thermal gasket/coolant valve or copper (if just want cheapest).

Simple.

 

Thanks everyone. I will probably go for the iso-thermal one.

- John.

 

If you don't live In CA or FL like everyone else, and live where it is normal to be cold in the winter and hot in the summer (other 75% of you U.S.)....well then go fly a kite instead.