Okay, I got some replies today.
--SCT Flash -- currently available if your local dealer has one in stock.
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Magnaflow Cat-back/Axle-back Exhaust
Random Technology High-Flow Cats: "We are planning to do converters for the '05 Mustang-- it's just a matter of getting a car so we can see what we need to do."
Crower: "We will have cams and valve train for the 3 valve engines in about 2 months."
Fluidyne Radiator: "We have not yet begun development of the 2005 Mustang radiator. I am sure we will develop one, but honestly, I would say it would probably be in the Spring of next year at the earliest. It is not on our development schedule at the present time."
Baer Big-Brake Kit: "We will have systems available for that hopefully by September, please stay posted to the Baer website."
Air Ride
Suspension: "Nothing scheduled yet but I am sure we will look at it this winter. Please check back."
Trick Flow: "We are not doing anything for the 2005 Mustang, Sorry...."
Koni: "The 2005 Mustang is currently on the R&D list. You can keep checking back through next year and we can give you updates as to where it is in the process. It could be up to a year from now before we will see anything for it."
Unorthodox Racing: "We have no current plans but we are in the process of developing a damper program that would allow us to make product for Domestic V8 engines. Stay tuned to our web-site for updates of the coming year."
K&N: "Thank you for your interest in K&N products. You have registered to receive notification about products for your vehicle. This email was sent automatically to inform you of available products that might fit this application. Listed below are the current K&N products for a 2005 FORD MUSTANG GT 4.6L." -- they list an oil filter. I did the questionaire on their website that you fill out for new product suggestions.