Tong ran 13.2 with bolt ons, Vit tune, weight reduction, 15 or 16inch wheels and was on slicks..
For 12s you need cams, 5.0 final drive, ITR 4th and 5th gear set, weight reduction, slicks and possibly ported head and or intake manifold. The 8th chassis is a pig, let alone FWD FTL.
He had his passenger seat out and the spare out -- thats about as much "weight reduction" as he does at the strip IIRC
My point is the FD and cams alone will put the car into the 105-108mph territory which is enough power for the 12s --- the traction will be the deciding factor and with a decent set of slicks 12.90s woudnt be a problem with 20-25 more whp and 700 more revs per gear with cams
I think DC-R gears could help with cams given the extra rpm you get but depending on the next mods they might be too short with a blower if drag racing is the goal
stock gearing + CTR FD + cams (9000rpm) = 116mph 4th gear = 330-350whp sweet spot at the strip running a blower
For a purely NA setup the DC-R 4th would cut down the mph to 100 without cams and 110 with cams. Adding the 5th cuts it down to 124 without cams and 137 with cams which makes it the optimum OEM gearing for max accel.
If your setup is going to need 5th gear the 0.972 certainly helps shorten it to be useful for drag racing with it but preferably you could re-gear the car to end in 4th so you dont have to add a shift into the mix
Consider if your making 450whp and trap 120-124mph with a big blower or medium turbo setup you need to be in 5th gear with the CTR final ....but if you use the 4.389 FD you can hit 126 (DC-R 4th) or 133 (stock 4th) with cams and not have to shift into 5th - less to go wrong and easier to make a clean pass -
Special note - if your making that kind of power (450+) and dont want to run the DC-R gears or cams (9000rpm) the stock gears and stock redline (8200) with the 4.389 FD will get you to 122mph in 4th (25.09 overall tire height) .....just running out of gear for that power level but a cheaper way to go. If you leave the stock FD in you will have to grab 5th probably around the 1000 mark.
Also I think the 4.389 FD will make wheelspin less of an issue in the lower gears in boost -- just saying, something to think about the overall setup and tuning when your planning your build to reduce headaches and being able to enjoy the first couple gears on the street.