I had a ford dealer installer the phase 1 Roush superchagrer on my 17 mustang GT. They had to remove the factory strut tower brace to make room. I cant find anything online to replace the brace. Do I really need it if I only do street driving with the car?

 

No you don't.

 

You don't "need" it, but they are nice to have.

They help stiffen the front suspension by providing added support to the strut towers,
preventing flex during cornering. The main disadvantage is that all vertical loads are
transmitted to the top of the strut towers. In hard or high speed cornering, the force of
the vehicle turning is transmitted into the strut tower, causing the strut tower and chassis
to flex whereas the suspension should be doing all the work. This in turn sacrifices some
traction and will reduce the speed you can take through a particular corner.

By connecting the two strut towers with a brace, the cornering loads on the inside strut tower
will now be dispersed across both towers, resulting in less chassis flex and ultimately keeping the
leading tire better planted and positioned on the road surface.

They also help with what is called "cowl shake", a condition often met when driving on bumpy or
poorly paved roads, more prominent with convertibles due to the lack of a metal in the mid
section of the car (roof).

Some braces have connect points at the firewall, those are even better, called a triangular brace.

2005 and newer Mustangs do not suffer from the same flexing issues than prior models.

Maybe down the road they'll have one, or make a lower tie bar.

 

Thanks!!