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I installed a similar bar (same design, long tube that bolts into those 4 bolts) and while it did had some minor play on it, it wasnt 1/4 of an inch, you might be exagerating, I dont know. What I do know is that it does not move once installed. I have been to the track since and I race on r compounds, the thing didnt move at all.
Now, did it make me a whole new driver and shaved a second of my lap times? No, but it did felt different, in a small but good way different. I assume the grimspeed one would work just the same.
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