Thread: JB3 vs JB4
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      05-20-2012, 11:43 AM   #2
Drives: 335i
Join Date: Mar 2011
Location: My car is my home

Posts: 2,016
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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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