If you are not set on the BHAF, I would get an AFE Megacannon (no AFE mount) filter only from Piers Diesel.
The price was really low, actually about 10 bucks more than I was paying for BHAF's!!
Use a piece of 4" white PVC to connect both, and you can make your own mount or heat shield.
A piece of 1. 5"-2" thick piece of styrofoam insulation works well to set the AFE on.
--Justin