Well basically ceramic is likely to rust out in a few years (esp. if you live back east), so in that respect performance will get pretty shitty. Ceramic does insulate heat from the engine bay better, but the actual performance difference is negligible... I certainly don't worry about it with my stainless DC. Go stainless, it'll last longer and look badass with all the different colors, as long as you keep it surgically clean while installing it (yeah, I didn't...

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'98 Integra LS - non-VTEC autocross / daily driver (aka Track-Tested / Mother Approved)
Daily-driven 87 octane Porsche destroyer
Latest Auto-X: 5th overall in class (7th/12 Day 1, 2nd Day 2). 10th/92 overall Day 2.
Complete mod list and updated race results here:
http://www.freewebs.com/white98ls - don't forget to sign the guestbook!

Autocrossing for a day is the best $25 you can spend