The GT4 out of the box is a great track car. There are however a couple areas where you can make improvements on the performance. BRRacing did a great write up on what they suggest you upgrade on the GT4 (read more here). Based on their advice I decided to upgrade the suspension to address these short comings but to also allow me to fit 305s in the rear and 265s in the front on 19” wheels. That extra rubber requires some suspension tuning to get everything to fit. Here is what I upgraded using Tarett parts. I basically went with Tarett’s Club-Sport “A” kit but added their adjustable camber plates (see kit here).
rear toe links
locking plate
front thrust arm bushing
thrust arm adapter
LCA shim kit
front tie rods
front adjustable camber plates
For wheels I went with APEX front 19x9 and rear 19x10.5 SM-10RS in black. I also added their stud kit for easy wheel changes. For tires I went with Michelin Pilot Sport Cup 2 with the front being 265 (stock is 245) and the rears being 305 (stock is 295). The car is already planted but this should make it stick.
