Aftermarket splitter??
The OEM factory splitters are pressure formed ABS plastic on both the GT350 and R, not carbon fiber materials.
You can try PVC/ABS cement to patch an area, but that would most likely require painting to finish and make it look original.
There are resin kits for repairing C/F parts, if it is an aftermarket piece. That would also require painting to get the cosmetics correct.
The OEM factory splitters are pressure formed ABS plastic on both the GT350 and R, not carbon fiber materials.
You can try PVC/ABS cement to patch an area, but that would most likely require painting to finish and make it look original.
There are resin kits for repairing C/F parts, if it is an aftermarket piece. That would also require painting to get the cosmetics correct.