I run stock rear bar and have also added extra rear bar from trz. the extra rear bar keeps the front of the car level at launch and both rear tires balanced, left to right w/equal traction. Most chassis shops will tell you to leave the stock one on. I run high 9s at 143 with 1.39 60fts. My car is nhra legal/equiped and rear bar definitely helped. In the end it's your choice go with what the experts say.
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AJ
306 w/vortech t-trim, A4 block,canfield hds. Etc
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