Part of my pm to Chris:
"There is a definite drop in inlet manifold contact temp(temp of the metal) a good 4-6 degrees C lower throughout all the time compared to before. I did the same drive as before, with the outside temp exactly the same at 8 degrees C...and in town it was noticably 4 degrees lower than recorded temp of previous test(doing 30-40mph...roundabouts etc), as moved out of town doing 60-70mph constantly, the temp had dropped 5 full degrees constant compared to the recorded temp of the same test before previous.
Obviously its hard to monitor exactly, with temps fluctuating and driving situations changing, but it has definitely showed it was present on the thermometer, as i ran several times over the weekend to see where it settled and became reasonably constant at certain speeds/runs
Granted its not going to be a noiticable gain of any type on the road, but its bound to do some good, keeping inlet temps cooler for longer, delaying heat soak, better combustion etc etc.
As for the plenum to inlet mani gasket, i did mention in my last pm, that its bound to improve it further, by reducing any further temp transfer from carrying up to the plenum. You would deffo be best using the 1mm ptfe for that though, as to ensure correct fit with oil breather at back of plenum etc.."
I can assure anyone looking at getting a set from Chris, that they do perform well and the quality is second to none, absolutely perfect fit with my ported inlets and easy to fit