In my case after installing the UDP, I noticed that the water temp would start to rise a little faster if I was stuck in traffic, presumably due to the water pump turning a little more slowly? However it was not a big deal and when the high speed fans kick on it stabilizes. I could definitely feel more of a kick in the pants in 1st and 2nd gear after installing it. I also did it to reduce load/heat on the power steering pump which is known to fail due to heat during sustained hard driving on the track. Although I never had any trouble with that before I installed the UDP.
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