How does the street and race version compare with the TB torsion bar you had?
That would be a difficult question for me to answer.
Although I have most of the TB products on my car, the rear torsion is not one of them.
However, I did have one that was VERY similar.
I now have had four different rear torsion stiffener bars on my car all worked well just some better than others.
Please don't misunderstand, TB and others make fine products and vendor variety is always good for the consumer.
I am NOT saying that any of these other products do NOT work.
I can only provide the thoughts as to why the Pierce Rear Torsion Bar was designed the way it is and yes, why I think it a better product
The only way for this bar to work correctly over a long period of time is that must be locked to two points on each end.
The purpose of this bar is to resist the twisting action of the "Twist Beam".
By attaching (bolting) to only one point on each end defeats this purpose.
Although when first installed, the one bolt per end mounting type will work and perform well.
Over time or extreme use it may fail because the mounting bolt can ware or the hole can eventually elongate.
So now the torsion bar may move within the twist beam providing little or no resistance as it was designed to do, it can also start to rattle.
The next type uses a cross bolt, so now it is attached at two points at each end.
This is a great design and it works extremely well.
The drawback here is in the installation process.
You must lineup and drill additional holes to put in the cross bolts.
This is not an easy task due to the hardening of the twist beam.
Another design used cross braces but they were held in place by "U" bolts clamped around the twist beam.
This not only looked ugly but also squeaked.
BTW, all of the above were made of mild steal.
Now we come to the Pierce Rear Torsion Bar.
The BEST of all to designs combined.
The cross brace design, for proper rigidity but with no additional drilling for ease of installation.
No use of "U" bolts or clamps but the use of Delrin bushings to prevent rattles or squeaks.
Made from chrome molly steal to provide strength and save weight.
Also available in two stiffness versions.
I think if you look at all the factors you too will find that the Pierce Rear Torsion Bar is the better choice.
Dave