You don't say what version of the B4 you currently have. However, if you were going to go for the SV Pro then I'd say it was a worthwhile move, but if you're going for the S1 version then personally I'm not sure I'd make the change because I'm not sure it would make a massive difference. I think you'd be better off staying with the B4 for now and bunging a tenner in a jar for a few months until you can get the Pro version. Particularly the big bore shocks are worth the extra in my view.
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Current Weapons: YZ2-CA, YZ2-DT, YZ-4SF.
In The Pits: Yokomo R12C, Yokomo MR4-TC Custom, Yokomo MR4-TC Pro, Yokomo MR4-Rally, Tamiya Blitzer Beetle, Tamiya M05.
Driven: Race Red Fiesta ST 
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