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That exhaust is made for the race body. Just use the other custom exhaust.
It is this mod: https://www.beamng.com/resources/distance-timer.1375/
You can also use this mod to check your acceleration:...
Discussion thread for my mod: https://www.beamng.com/resources/drag-racing-bump-box.7475/
Note: requires a transmission with a transbrake. I recommend Wahlfactor's Better Drag Transmissions
How to use:
Make sure your vehicle has a...