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about the TB size / coupler size and posing it as some sort of problem in the design. I simply clarified your statement and posted empirical data which shows that its not a problem. Then you questioned the long term aspect of the fitment, and then again I clarified your claim with empirical data, showing it to be inconsequential. With the education you appear to have as per your profile, you should know very well that the thermal element you once pointed out in terms of using stainless steel vs. something else has negligible differences. The airflow is simply too fast for the charged air to absorb any significant heat from the hardpipes themselves. I stated before that there would be more of a power difference in the atmospheric air dropping 1 degree vs. the difference between stainless and any other metal for the hardpipes. Stainless is the ideal choice of materials due to its high resistance to the elements which provides a low maintenance kit. It appears that your kit will come as mild steel which is chromed. FYI: Chrome cracks and flakes off - maybe not in every instance, but SS wont experience this. Its obvious that the fact you are offering your own hardpipe kit would prompt resentment to this post and accordingly, your responses. I'm trying to keep it civil by providing information that I know to be correct by my experience and not theory. Theoeretically, using a slightly smaller pipe to make the fitment a tad bit tighter sounds good admittedly, but it has been found not to be an issue. Although it may sound bad to use stainless for thermodynamic reasons, if you do the theoretical math on the thermal transfer from the hot hardpipe (from the engine bay's heat) to the air within it, you'll find that there is going to be less than 0.01% difference between using any two different metals. I'd be willing to bet that aluminum would actually be the least of choice as it is more willing to 'give the heat up' that it absorbed from the engine bay, not to mention its high maintenance. You are the ceramics engineer and I'm sure you have had tons of thermo.. How about working up the numbers for us based on a 200F degree engine bay, 550CFM of 140F degree charged air at 20psi, flowing through a 4" long, 2.5" diameter pipe. The pipe material will be chrome plated mild steel, 304 stainless steel, aluminum (pick your alloy), and mild steel. You are trying to solve for the change in temperature of the charged gas as it passes through the pipe. From that information we will be able to see the point I'm making on the choice of materials.
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