No its not pointless, less weight = less rotating mass = more free'd HP
Bad things about UDP's are they slow your waterpump down, which in a hot motor like the SR that probably isnt the best Idea.
You make power from pullies 2 ways, Rotating mass and slowing accessories down, slowing the alternator or PS down a little rarely causes problems unless you are in a very cold climate or have a large sound system, but the SR's water pump will be slowed down with a UDP so best try avoid that.
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