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Old 06-27-2025, 01:45 PM   #22
RotARy15
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Join Date: Mar 2019
Drives: 1993 Mazda RX-7 R1, 2025 BRZ tS
Location: USA
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After a week, my opinion has actually improved. Still no increase in NVH, and the driving dynamics are noticeably better. I think this is probably the best overall balance of NVH and performance. I'm convinced that the drivetrain is now plenty stiff. I will eventually test going back to the factory transmission mount just to see what happens but I'll only do it with the convenience of a 2 post lift and boredom.

The shifter is solid enough; no discernable movement. The car's rubber band effect is completely gone. Any sloppy shift work from the driver is punished once instead of yoyo-ing your lunch up. Stop and go traffic no longer has that mini-game of "can I give it 1% throttle in 1st without convincing the passenger that I'm an idiot".

ETA: I went back under to check torque. Headers were torqued to 22ft-lbs and didn't come loose at all. Engine mounts to subframe were torqued to 33ft-lbs and both were slightly loose after 6 trips. So watch out for that.
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