look for pt cruiser engine mods (and anything chrysler that holds a 2.4L, the toyota 2.4 may be the same, haven't read up on it though). You could probably find a stock 2.1(?)L Turbo pt cruiser engine and take the exhaust, turbo, and other stuff and swap it! (the other sized corporate four cylinder is the same block) Not sure about what else...
Of course, I could be totally wrong on all of this, I've only read about it a little bit.
Do some research and find out if what I said was true, I guess my only sound advice is to look into the PT cruiser engine upgrades.
hope I helped!