Has anyone just chucked WRX 4pots on yet? seems like this would be the cheapest upgrade, yet not much info on it yet.

Another thing to consider is the cost of ownership now & into the future. Typically Toyota brake setups last years & don't chew up discs/pads if you don't thrash the braking system. Not sure about the Subaru WRX disc/pads tho. The 86's system is already pretty good. I know some cars chew thru pads & discs like there's no 2moro. Be mindful of that.

i think the major contributor to that is how heavy you are on the accelerator and subsequently the brake..

I would go for a system that's designed for the car. Just throwing a set of calipers at the car that's not matched to the current braking system will possibly affect the ABS and ESP systems and also the brake balance.

I looked into this but im most likely going to upgrade to GTS spec brakes and have good pads and fluid to start of with.

The ap racing sprint kit from essex is mighty tempting for track work though.