All WiSE owner, or those who changed their extractor to the WiSE 4-2-1 know that the engine bay is extra hotter than normal Wira.

This is due to the nature of the 4-2-1 extractor, and also due to the heatshield that is not long enough to cover the top of the primary pipes.

Other than hot engine bay, that leads to accelerated ageing of the rubber & plastic parts, hotter intake air temperature, etc... the exposed extractor also means that the heat lost in the tubing can be affected by...