You forget - I'm a metal guy, I'm not certain whether or not JBA uses 304 or 400 series stainless. The difference is in the nickel content - 304 (or 18/8) stainless has 18% chrome and 8% nickel content - you're right, won't "rust" (it WILL oxidize and have some surface "rust" if you expose it long enough or if it receives any abrasions)
400 series (409 or 410 which is probably what the alternative would be) is basically "chrome steel" as opposed to "stainless" - it has 10-12% chrome and like 1/2-1% nickel. It still won't rust through, but it will probably show some surface oxidization.
For $200 it isn't a bad idea to get them coated...the company I found in Worcester, MA offers silver or black finishes...the said the silver looks better/lasts longer.
'08 GT sport/premium, tints 20/35, 18" TSW nogaros w/ bridgestone blizzak winter, 19" sport oem w/ hankook evo summer, Philips crystalvision bulbs, debadged, Vararam OTR, JBA 1-3/4" LT's, ported TB, MF axlebacks, MF X-pipe, DBA-powerslot brakes, russel SS lines, hawk ceramic pads, GXP shocks/struts, lovells poly strut mounts, Slowhawk Tuned 344/356
Gone -'04 GTO A4 2.5" custom exhaust, sweet thunder muffs, H pipe, Z06 heads, Baer brake it, 20% tints, torrid red, AEM brute force intake, tuned