Another thing which I have found with mine is that I too heat wrapped the downpipe etc, but found after a few years that it was eating the piping away. So I have just had it all Ceramic coated, I've also had the Manifold Ceramic coated as well. I noticed when I had the manifold Coated that the intake temps would not rise nearly enough with a quick on boost overtaking manouvere for example, I also found that the intake temps dropped very very quickly as well.
Another thing I did is wrap a Thermotec heat wrap blanket on the underside of the intercooler, to reflect heat & helap with the heatsoak that the WRX engine is renown for.
I also had all my intake piping Cerammic coated too.
regards
Jak
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