318 1/8 time improvement
So...it basically ran the same (not knowing the DA, humidity, wind speed, etc.)....which is why I said for a slower car (aka, mostly stock) all you need is a sticky tire and a decent shock....and the slapper bars really don't do much.
I did like 318willrun's video on open diff rears, stock springs, and traction bars, it was a good explanation of why they should help in that scenario....but, I don't know hardly any "racers" that use open diff rears. The couple that do use a sticky tire and good shocks and have zero traction issues because their cars don't make enough power to disrupt the chassis on a prepped track surface. The good news is traction bars are cheap...so you really aren't out much money.