How about the fuel,in the carb fuel bowl, rushing to the front of the car and leaving the jets uncovered by gas.....Lean!!..instantly!
The jet extensions are designed to overcome that. They extend the jet intake towards the front of the fuel bowl keeping them covered. I always blip the throttle and downshift when slowwing down...well 90% of the time.Makes everything smooth.
I think, One has to always remember that when driving a Cobra most things happen a little quicker than in most other cars.
John