I went to clean my cone filter on the CAI on my Bullitt today and found the gauze is corroding on the filter (must be cheap ****). There is no marking or part # on either the filter or the intake (so I don't know which make i have as I bought the car with it already installed). Anyway I decided to replace the filter and wanted to know what size would be the biggest i could go and still fit in the fenderwell? The intake pipe size is 3.5" o/d bottom of the cone 4.75" top of cone 3.5" length 5.5". The green-filter website in the uk lists this size of filter but says only suitable for applications up to 250hp. Do I need to / can I go bigger?