X12 was never released for the client version of LFS, it's only for the dedi. The X to X10 upgrade is linked to on my site and in the readme.txt, which should be all you need.
Bloody awesome, had a blast with this. The car is a beast, and without a fine tuned setup it's hell for sure, but at same time very enjoyable.
Thumbs up for this, now we just need a Nascar V*b.
Server has been setup as hidden, this way you don't overwrite real online PBs. This, however, makes the server not show up on the LFSW listing of servers, so you have to type the server name manually to join.
I didn't make any setups for road course or drag racing. If people feel they have come up with competent efforts, post them here for others to use, and I might even include them in the next update, as I've come across a couple of little bugs I need to fix in the app asap (probably Tuesday night). The changes won't affect the car, so online compatability will be unaffected.
I don't know if you have them but here are the specs I found on the National Guard/GMAC Car - Monte Carlo SS (Car of tomorrow)
Exterior
Wheelbase: 110 in.
Length: 200.7 in.
Width: 72.5 in.
Height: 51 in.
Tread width: 60.5 in. (max)
Curb weight: 3,400 lbs (w/o driver)
Chassis
Design: Rear-wheel drive
Type: Tubular
Front suspension: Independent, coil springs, control arms
Rear suspension: Trailing arms, coil springs, panhard bar
Steering: Power, heavy-duty
Brakes: Four-wheel disc
Wheels: Steel, 9.5 in. x 15 in.
Tires: Goodyear Eagle racing radials
Frame: Rectangular tube by Hendrick Motorsports
Braces & Roll-cage: Round tubing built by Hendrick Motorsports
I'll try this one tonight, Bob... If it's any good I hope to god the devs will give us a NASCAR in the next patch (after the VWS) and a couple more ovals.