I have a 2004 ION 3 QC. Got it at the end of June/04 and just hit 11,000 kms, not a single problem yet, 3 oil changes. I'm supposed to go in soon for the dealer things (daytime running lights and turn signals, and the rear bumper scuff problem under the trunk, and possibly the front control arm bushings but I haven't had the noise yet))
Installed a 2.5" cat-back exhaust system and custom made air intake and have a set of Eibach pro-kit springs lined up for the spring.
I frequent
http://www.turbosaturns.net/forum/index.php a lot, excelent info and very knowledgable people. They now have a Ion/Ecotec performance section, where a guy is just installing the Haas turbo kit on a sedan, check it out......