Stock tune. If you downshift rev match perfectly into 2nd gear at 40mph you will have the loudest pop ever. If you don't get it perfect it might make several quieter pops/burbles but still there. Do aftermarket tunes still have this? Looking at the dizzy e30 tune and was curious if I need to get the pop add on? I don't want pops all the time just at that range like the stock tune lol more natural.