Jb4 is the way to go because it gives you the option to do w custom tune.
Lap 3 i believe is capable of more power but its not a pleasant experience from what i hear. I recently got a jb4 and map 1 alone changes the car into a monster. I feared for my life in the brief time i spent testing map 2. Definitely fun, but be mindful of the precautions you need to take such as colder spark plugs. They didnt work out for me so im using stock plugs with a tighter gap, which shouldn't be an issue considering i leave it in map 0 (jb4 off) most of the time and i only really use map 1 (2 or 3 more psi i think) for fun. I would like to learn to get into the whole custom tuning because thats how you can really bring out the best of the car (or blow it up) and utilize your mods
If you just want something to plug in and go, i recommend buying a spare ecu tuned by sxth element.
AND MAKE SURE YOU USE premium 93 fuel