plastic ones are good, the chrome ones are good looking, i have seen people wrap them in heat resistant stuff so they dont heat up. The ones that dump into the fenderwell arent always the best because of the 90 degree elbow before the MAF. i belive it casues the motor to run rich. Just do what i and a few other here have, get the cheap chrome one off ebay, get your sawzall and cut the 90 bend off where it begins to curve, and get a 9" or 10" k&n filter and a heat shield. here is a link with a few pics of what i am talking about. http://forums.stangnet.com/showthread.php?t=433668&highlight=mac+cai
i have the steeda one, the only reason i have it is beacuse of the open element filter and the fact the the piping is big enough to work with my 75 mm TB.
Here is some good advice. Save you money get you something like some pullies or a timing adj. you will see a lot better power gains. You might not even see a gain with a cold air intake. IMO.
Steeda CAI sucks. Gives the engine lots of hot air. Used it for some time but sold it, now I have the Kenne Bell Cool air kit, that goes in to the fenderwell, much better!