"Pre-catalytic" filter?
 

http://www.alternativeauto.com/image...ecatalytic.jpg
I was looking around at different shop websites because we are going to get the mustang (2007 GT) tuned and i came across this at alternative auto's website. Thay claim 4-5 horsepower form removing it.:confused: Can you just remove it without getting a tune, or messing up the factory computer? It seems like it could be a big restriction in airflow.

That is one of the reasons why 05+ Mustangs need a tune w/ a CAI since they remove that.

I have an 08 but dont have that filter.

If memory serves me correctly, that is on California cars only.

Well if it is only on california cars that is a kinda interesting thing to put on a website for a michigan speed shop...