Jim, these are the only Air Fliters we sell to our 03 Cobra Customers! I have been using them on all my cars for over 7 years. You want Maximum Airflow and "No Air Turbulence" before the MAF Sensor, especially at Wide Open Throttle on a Forced Air Induction Engine, this is the Ultimate Filter, second to none. Hope this helps.Jim Vaccaro said:Anybody use these..?? They Make a 10in Filter a little better then 9in and no Fitment Problems like a 12 in..