anyone have one of these
 

it came in a parts car

I have one that I got from Mazdatrix. It's a torque brace, and seems to work pretty well. I may have the instructions for it somewhere, if you're interested in them.

the only proplem i have with it is that hose on the brake booster

Yeah, it looks pretty close. You can't move or bend the brace, but maybe you can just use some longer tubing and go over top of it.

Also, you could try taking off the nuts where those rubber bushings are, and seeing how the car does without the brace. You might find that you don't need it, and can remove it.

The brake booster line isn't just a simple hose, it has a valve in it to hold the vacuum.

its alot better with the brace on i didint think that i would make that much of a difference but i does

FWIW, the S4 did not have a check valve in the brake booster hose. That was added later to comply with DOT regulations...

The only disadvantage about torque braces is that they cause the engine to twist in it's mounts. This can shear them off after time...

Interesting. What exactly is the check valve's purpose, and would it be beneficial to put it on my s4? I've got a spare line with a check valve.