300/440/550 magnum pump on a x2 ?

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hello guys,
i,m from the netherlands I have build a race x2 for a good friend of mine.
the ski hits 50 miles p/h at this point with a 750 sx pump.

I,m planning to buy a 12 vein set back magnum pump from skat trak for the last top speed miles,

does any one know if the magnum pump gains in top speed ? and how much top end can we gain ???

I will post some pictures soon but i know that some other racers from the netherlands are here on the forum and the don't have to know what we are racing with this year

hope you guys can reed my bad english i,m still dutch

greetings from the netherlands
 
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