Well I installed Motordyne's IsoThermal upgrade on my Z yesterday. I already had the MD 1/4" spacer so I only bought the thermal upgrade kit. It consists of a thermal gasket that goes between the lower plenum and the intake manifold and a bypass valve for the TB coolant line. It also includes all necesary hardware and very good instructions.

The install is very straight forward and took me a leisurly 3 hours including breaks. Its not hard at all just tedious since there are a lot of screws to undo. All in all it is yet another very high quality product that I have come to expect from Tony along with his fast and reliable service.

I will be taking some plenum and TB surface temps over the next couple days so we will see what the product actually does.

 

Cool. I'm thinking of going with the 1/2" spacer when the GB happens.