Just installed JB4 upgrade kit for the JB3 PNP. Wasn't that hard, took time and from hood open to close was about 2 hours. I have an older PNP, so I had to cut a wire, and made a plug with some electrical stuff I had lying around. All I can say is wow!
SOOO SMOOTH!! Its like butter! Map 1 feels faster than JB3 MAP3, & map 2 is just crazy! Love the ability of switching maps, and using a menu type system by barely moving my fingers from driving. Gauge hijacking is awesome, will def be using that when summer comes. With all my gauges flying around and hazards flashing at me I'm so excited I'm watching the dash, trying not to crash! Haha
Tried Map 2 (7ish from JB3), which I've never tried map7 on my old one. I have supporting mods plus 93 oct, and temp was 52 with dry roads today. I did a rolling start in 1st, and before my foot hit the floor (wot) my tires (255 Cont. Extreme DW) broke lose and spun up to redline. Dhamn! First time my tires spun since I've bought them (without trying).
Thanks BMS, just bought some wheel spacers... Mod bug bites hard...