it's because you forget to change something in the carmods lines, due to the fact that the only tuning parts that it has is the nitros, also this is an addon car mods that requires FLA in order to install them (vanilla games only)
the spelling on the rear lights dummies are wrong this screws up the positions of the rear lights by the way (it was located on the middle of the car instead of the rear, because of the misspelled dummy), to fix this, renames both rear lights dummies to taillights1 and taillights2
this screws up the positions of the rear lights by the way (it was located on the middle of the car instead of the rear, because of the misspelled dummy), to fix this, renames both rear lights dummies to taillights1 and taillights2