Nice, did you get more rotation after installing the rear strut bar?
The SRT-4 has a MacPherson strut setup, so installing a rear strut bar should induce more understeer because it will give the rear tires more grip. When you only had the front strut bar on, you had more grip in the front than the rear which means more oversteer (less grip in the rear tires means that it will slip before the front=oversteer).
What you probably felt was the car's handling returning back to understeer. But with the extra grip at both the front and the rear, it became faster. Unfortunately, it also came back to its tendency to understeer.
Just letting you know that that's the reason why strut bars are mostly sold separately. You really don't have to have both. It's actually better to just have the front and not the rear. But try running on the track and compare your times of front only versus front + rear to confirm this.
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"75% Driver, 25% Tire, 5% setup." -D.G.

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