An update! So I was talking with the Blade Arma guy, and I asked him what the codes were and about the checks and such. The head is NOT a separate car, I personally confirmed this with the emulator No$psx when going to the RAM Address location 80164766, which is what hex slot and such Computer Car 1 is.
To double check this I made Computer Car 2, which is at the location 80164767 as 0F, because 0D is Minion, as 0C is Sweet Tooth, but the game crashed because 0F is not a valid car. Not to mention the game didn't automatically set the Computer Car 2 slot either when I chose Hong Kong.
As some of us whom have played with the GameShark codes we could get here and there, I'm sure Luis knows what I mean on this, I've seen his enemy Dark Tooth videos that 30164766 000E is the GameShark code for setting Computer Car 1 as Dark Tooth, but of course we don't have our head yet except for in Hong Kong. So I theorized "hey, what if there is a check that runs through in the game whether to give Dark Tooth his special napalm cone machine guns, and his head?" Which leads us to the values
80103F78 0000
80103F7A 0000
Upon setting those two RAM Address hex slots to 00, he was fully functional upon testing in Moscow: Suicide Slide (I figured it'd be fun to have a 1-on-1 against Dark Tooth in Moscow
) and yes he does end up having his head, but what's curious is that his napalm cones either weave up and down like Sweet Tooth's normal special, and sometimes they kind of spiral in a strange pattern, but nonetheless, enjoy!
I personally recommend these codes for a true challenge.
30164766 000E (Set Computer Car 1 as Dark Tooth)
30164767 000D (Set Computer Car 2 as Minion)
80103F78 0000 (Check bypass I think?)
80103F7A 0000 (Check bypass I think?)
3001A23F 0008 (Sets the difficulty value to 8, which is beyond the normal reach being 00 is Easy, 01 is Medium, and 02 is Hard, the RAM address location of this would be 8001A23F. Why 08? The YouTube user GameSharkWizard set it to that value, I personally set it to 0004 because TOO high of a value means too extreme of an artificial difficulty. It's already bad enough they get infinite ammo and are able to spam weapons that you normally can't)
30164761 0009 (Forces it so the max CPU Players is this, Holland already sets it to this, but go ahead and try it on levels that don't have a 9 car limit.
Now I know I know, some may be asking. "But wait, how do we play as Dark Tooth and have the head?" I haven't had the time to try it, but I theorize bypassing the check and simply forcing the game to make Player 1 be Dark Tooth would be enough HOWEVER, I'm not positive about this. I'm sure also that still, yes, Dark Tooth's non-functional special weapon was potentially replaced with Sweet Tooth's as his special by Blade Arma, and I haven't gotten around to asking him about that. I don't want to pressure the guy or make him uncomfortable because unfortunately nowadays him and I seem to really be some of the few people left interested in hacking Twisted Metal 2 and have made a conscious effort to do so.
Here are also two reputable sources to consider
http://gamehacking.org/?game=90075&hacker=all&format=originalhttp://wescastro.com/codetwink/cheats.codetwink.com/psx/view/2100/default.htm#q3EDIT: Okay I figured out at least one thing. 80103F78 tells the game what level to give Dark Tooth his head on, by default it's 08, which is Hong Kong. If you set it to 00, it'll allow him to have his head on ANY level. Still not sure what 80103F7A does, by default it's 0043. I'll mess around with it and see what it does. Oh, and I just confirmed that you still don't have his head even when you do the bypass. I'll keep looking around.
EDIT 2: The 80103F7A value appears to have to do with where the napalm missiles are fired from. The 0043 value essentially is the Y value (vertical, up and down, how high or how low) 0043 makes it so the missiles seem to come from the head, but they have difficulty hitting you because they're being shot from too high, so I guess his reason for making it 0000 was so it fires from the ground level so it can hit it's targets.