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Im not bashing RC but i would like to make couple things clear.
The RC ultimate is comparable to the JB stage 1 not the JB4.
RC ultimate and Jb are both boost controllers that adds boost accross the RPM range.
Jb4 offers datalogging, code reading and deleting, boost control by every 500 rpm, smoother delivery, etc...
If the comparison is between Jb4 and race ultimate, in my opinion Jb4 is better because it is a complete tune.
That being said a more useful comparison would be between Jb and race ultimate since they are both stage 1 tunes.
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