when I talked to vorshlag heres what he told me.
get 18x10's FIRST
you don't need a watts link. hell, you don't even need lca's according to them. the biggest improvement they saw in rear end handling was JUST from the relocation bracket. they had a watts link on their car, they took it off since it wasn't needed to save weight.
according to them, all you need, is more tire on the road (18x10's), their bilstien monotube setup, and lca brackets. this was their advice to me being a guy that's on track in some form or another almost weekly (I hit road courses, autocross, shifter kart tracks (yes in my mustang, very autocross like), and the dragstrip.
2013 Performance Pack, MCA, Leather Recaro's, NAV
Steeda Cold Air Intake | BBK Throttle Body | Steeda Shifter Bracket | Whiteline Transmission Mount | Magnaflow Street Catback Exhaust | Tuning Super Store Tuned on a Diablosport Intune i1000 | Eibach Sportline Springs | Koni Sport Dampers (Yellow) | Whiteline Lower Control Arms
Team Magnaflow | Team Road Race Motorsports