Stock 156 discs apparently are the same. Don't know about GTA discs however.
Are you still running the totally stock setup?
I'm still saving up the $$$ for my brake upgrade, which is only going to be a very mild slotted/crossdrilled DBA front disc, stock rear disc & EBC greenstuff pads all around. Changing your fluid to something fresh & upspec may also give a bit of improvement if it hasn't been changed in a while.
Do something soonish if you think it's below par. Going fast is easy, slowing down is not...
