Haha, you can be content in life now. Missing cars in FM can eat away at you

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With regards to the Forza Motorsport 2 Unicorns, I added these to the dealership a while back. This was a bit more involved. It was the only Forza game I've encountered where the Unicorns had no entry in dealership within the database. So you couldn't just make them purchasable, as they didn't exist there. Luckily, all the car data for the Unicorns is contained within the database, for when they were gifted by Turn 10. So I just recreated their entries for the dealership using the exact data from the 'Data_Car' section for each Unicorn. They also work in Arcade Mode. Another issue was, the moment you added the latest title update (TU4 (which you need installed for the DLC to work)), it would obviously cause the modified database to fail the CRC check run from the TU's xexp, causing the game to throw a dirty disc error. I had to integrate TU4 into the main xex, then modify it to bypass the CRC check and look for 'media.zip' in the game's directory rather than the 'Cache' folder. You can safely remove the title update from 'Hdd1/Cache', as it's integrated now. The file in question is: 'TU_16L61VA_0000008000000.0000000000102' for the US version, 'TU_16L61VA_000000C000000.0000000000103' for the European version, and 'TU_16L61VA_000000G000000.0000000000104' for the Japanese version. It's not strictly necessary to remove it, but it's never accessed now, so redundant anyway. Before messing about with the title update, I did check to see if the FM2 Complete Collection xex had it integrated, as per FM3 Ultimate Collection and FM4 Racing Game of the Year Edition. But unfortunately the xex is identical to the standard release (Media ID: 0DF2D3F6), they just bundled TU4 (named 'title_update.bin') on the second disc and it gets renamed and copied to 'Cache' during the DLC installation. I also confirmed the Media ID's on Redump too, and there are indeed only three ID's (one per region).
I've done this in two flavours. The first version works with all saves (new and existing). This immediately makes the Unicorns available for purchase in the dealership at their preset prices, and are purchasable regardless of the region you chose when when you started the game. It also instantly unlocks them for use in Arcade Mode.
The second version is for folk who are starting the game on a fresh save and want to unlock them for purchase in the dealership via progressing your career driver level. I did this in keeping with the spirit of the game. Because the Unicorns are quite unique to their country of origin i.e. weren't really exported (bar a few Mitsubishi Lancer Evo VI TME's making it to the UK and Oz), I've made them region specific. Each Unicorn only unlocks at driver level 20 when you're playing Career Mode in their region of origin. If you wanted to buy the other two outside the region you've chosen, you would need to change region during your career, same as you would to purchase other unique cars specific to their region e.g. Chevrolet Corvette Grand Sport (North America region driver level 25), Mazda RX-7 Spirit R type-A (Asia region driver level 25), and the Lancia Stratos HF Stradale (Europe region driver level 10). With regards to the Arcade Mode, I've made them pretty easy to unlock, as they're only Class C (Chevrolet Camaro 35th Anniversary SS), and Class B (Mitsubishi Lancer Evolution VI TME and Lotus Exige Espionage) cars. The Camaro unlocks by finishing Exhibition Race 1 in 3rd or better. The Evo unlocks by finishing Exhibition Race 2 in 3rd or better, and the Exige unlocks by finishing Exhibition Race 3 in 3rd or better.
Pre-unlocked version:
--Dealership--
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--Arcade Mode--
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Unlocked via progress version (for new game):
--Dealership--
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--Arcade Mode--
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Title Update 4 integrated into main xex:
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I can't post the files here, so you'll have to drop me a PM. I'll probably also stick a video up on my You Tube when I get the chance.