Different noticed for rear strut tower bar?
 

Just curious if you can feel the difference?

I am putting on the front Cusco for little more, I get the brake lock up from the weak firewall.

So how effective the front, is marginal as I get a win/win here for not that much.

But what about the rear end? Put it on and notice a change?

The rear bar that connects the two "struts" doesn't do anything. The rear "struts" are just shocks, really. They don't locate the suspension at all, so they're never under any lateral force. You'd be better served with under-car bracing in the rear and bushing inserts.