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Will I notice a difference if I run VP U4.2 ? I read it's a leaded fuel, does this have any negative side effects?
 

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I think it may harm your O2 sensor after a while.I ran some in my kfx.It works really good.I am now running Motorsport 103 from VP.Its unleaded.
 

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nope we dont have an 02 sensor that is why you have to buy a programmer to change the fuel curves after any modifications.
 

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I buy it from a local dealer. There are quite a few people around here that sell it. Just go to your local mx track usually here there are local vendors at the track that sell it.
 
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