We had the opportunity to replace a customer's custom E30 E-Tune with our own version of an E30 Tune using our in house dyno for comparison. The car only picked up a few peak WHP, but over 30 lbs of peak torque and as much as 20-30whp and 20-30 tq pretty much everywhere in the RPM range! Gains were very noticeable behind the drivers seat!
Dyno Chart for E30 custom tune already on the car (not a JST tune):
Dyno Chart for our custom E30 tune: