What do you guys think, is it worth getting?

 

Well.... that depends.... what do you intend to do with the information, once you know what your AFR is?

 

My thoughts exactly.

 

Especially on a justacooper.

I'm considering adding a whole PLX gauge setup with AFR, EGTs, more temp probes, their OBD-II module, the works.... while it's nice to know your AFR, I can test this periodically with my tuner's portable rig. "Aggregate" AFR is useful for tuning... if I really wanted diagnostic value, though, I'd need either AFR or EGTs for each cylinder - since the issue some of these cars seem to develop is "hot" or "lean" individual cylinders (whether due to unequal airflow, or a clogged injector, or whatever) - and you may not catch that if you're looking at AFR or EGT after all the header primaries merge back together....