Suspension Talk

Hello everybody! I've got this coupe on Ground Control coilovers (Koni yellows & 440f/750r springs) with stock 318iS sway bars and new end links/bushings/reinforcements everywhere. Considering the current sway bars are 20mm front and 12mm rear, that's one possible upgrade I was considering. Strut braces front and rear are another consideration.

Honestly the car already handles like a dream, so I'm coming to you guys for opinions. At around 400USD for a pair, depending on which brand, would it be worth it? Most of the kits I'm looking at are 22mm front and 19mm rear. The purpose of the car is to be autocross capable, mostly street. No drifting or track.

So what setup are you running and what are your recommendations? Thanks!