I heat wrapped my new 3" dump pipe only. Not really for any performance boost, but mainly to protect the speedo cable and other various parts from overheating. I got 10m by 50mm wide wrap on a ebay auction for around $60. It was a proper auction not a buy it now price, and it seems to have helped alot.
When I popped my bonnet the other day, I could definitely feel the less of a heat wave coming out of the engine bay as I opened the bonnet. Plus I have a unboxed pod in the engine bay with a temp sensor, and I am seeing on average 2 to 3 degree drop from the standard pipe with heatshields.
I acutally used the whole 10m roll and double wrapped my dump pipe so that it has at least two layers of heat wrap on it.
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RS Liberty - Because WRX's are only good for parts...
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