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Well, I just pulled my 750 Race Demon and replaced it with a ProSystems 1000. I have not been to the track yet, but whoa!!! What a difference. It now pulls extremely hard top end!!!!!

I switched believing my MPH was soft compared to my ET, I think this may have been the cure..
 

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After 20 plus rear wheel dyno pulls over a 2 year period, I finnaly got tired of trying to tune a 750 Speed demon to give me decent A/F curve.
We put a Pro-Sytems 950 XE on it, and perfect A/F on the first pull.
Snappy throttle responce now as well.
Not hugh power increases, but the curve got flatter longer, pulls like crazy all the way through to the limiter, at 6,600 does not want to quit makin power
You will see a difference in your times.
 

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1974 chevy. Ova
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still waiting on just one more check...then i can order mine. damn...
 
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