as I fitted all 3 at the same time it's hard to narrow it down so I will say this much....with the jdm arb, tie bar and rear J's Racing strut brace...the back end is rock solid and very awesome.
The front strut won't do much because it isn't point to point like a strut brace should be, but with the ETD..I friggin' love it, it's a huge difference over standard, raised my idle to 1040rpm and don't notice it at all on tickover, launching and uber-enthusiastic gearchanges are so smooth it's a joke...I do have es inserts as well mind...The car just feels so good at the moment.