Probably has a roll cage too.
He said "all the Road race competition cars have them"
But the point was the strut tower brace doesn't make the vert > the coupe
It's the stamped piece above the IRS in this picture. It bolts into the cars body. The aftermarket makes stiffer bushing and braces to tie it into the body better.
@MAT1955
What BMR had to say about those braces (which rust out like yours did and most people ended up just throwing them in the trash so they didn't have to take them off to work on the rear of the car):
I do not have the engineering or "scientific" data to back up my thoughts on this.
But...
So why doesn't the Dark Horse R have a strut brace?
companies like Vorschlag have said there is no measurable improvement in track times from a strut tower brace.
Strut tower braces don't do shit, especially stiffen a convertible up to coupe levels...
tires/alignment/imagination is where I would start
but it's kind of pointless if you don't have any recorded numbers for each car (skid pad, slalom, etc)
I like how they call it apples to apples but they have the stock exhaust on the Roush car and headers etc on the Whipple car...
Put longtubes on the Roush and drop a pulley size or two (to keep the boost the same) and run it again...