Thread: JB3 vs JB4
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      05-20-2012, 11:43 AM   #2
Beemw335
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Drives: 335i
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Boost is boost, jb4 will probably make the exact same power if it runs the same boost, but it will be much smoother than jb3 for sure.
If you have it, try it out, and if you like it then leave it, if you dont like it then put back jb3.
Btw what track do you go to? Mirabel? Napierville?
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