Ronald................the drifting competition now makes sense.

Another wrinkle besides tire compound is heat range. If you were to run say a 265mm front it would likely never warm up. My son runs a Kart at local Autocross (Gymkhana) and on really cold days we'll pump the tires up for a smaller contact patch which puts waaay more heat in the tires so they get up to temp and offer more grip.

On my road race coupe I run 27 psi all around.

If you can find a LSD get one, this past weekend at a track day coming off a second gear hairpin I could do drifting exhibitions no problem (The car has a 4.11 LSD and 4 speed close ratio gearbox)

I'd have top do the math but I believe the lower profile 185/13 vs 155/12 would offer you lower gearing.

On the rear sway bar it'd be really easy to fit one off another car; the 1200 rear bar bolts to the chassis rail just ahead of the rear tires and then clamps to the leaf spring. I think you might be able to purposely fit a larger rear bar for oversteer.......................simply leave one side disconnected for daily driving then when you arrive at drift competition bolt the one side up (you only need to disconnect one side). When we have heavy rain races I disconnect both sway bars to get more bite...........takes me about 2 minutes tops.

Tom