The manual I was given with my 04 includes information on the 2.2 and the 2.0 supercharged ions. It did come with an extra set of pages that were specific to the Redline. Nothing major, just some items they felt the 2.0 engine needs, I believe it had to do with the engine coolant. Otherwise it should be exactly the same as the regular Ion
The owner manual I got for my '05 was for both the regular IONs and Red Lines. When it lists engine information, there was information on both the 2.2s and 2.0s. The customer CD that came with the manuals had a track on it specifically for RLs, but all the other features listed were true to both cars. I know the insert that was included was for maintanence/wear and another one for the advanced audio and all the different types of stereo options. I'll have to check next time I get in my car if there's any other inserts, and what specifically was mentioned about RLs in the manual for you. I don't see why the one they gave you doesn't have RL information in it since I'd think that they include the same manual for all ION cars. It wouldn't hurt to ask the dealership to get this manual for you, especially if you're not going to be the only owner of the car. It'll probably take some time to get it, but it's probably smarter/safer to have it.