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JB Stage 1 always felt jumpy to me.. and now especially since I've gotten the JB4, I wonder why I haven't done so earlier. JB4 makes the car feel so much like stock that you wouldn't even know it has a tune until you romp it.
I had an issue with my car or the Stage 1, but if I were WOT in 2nd and shift to 3rd and go right back to WOT.. the car wouldn't give boost back. The car would essentially fall on it's face. What I ended up having to do was: WOT in 2nd, shift to 3rd, and steadily increase throttle for boost to build.
The Stage 1 kit just adds boost no matter what, so even on normal acceleration, if you hit the pedal too hard... you're jumping around. The JB4 fixed all of that and I can't be more happy. Definitely recommend JB4, even if you'll only keep it on map 1.
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