This mod removes the tracers and changes the smoke a bit (optional).
This mod alters your shell_table.lua file and will not pass integrity check. It may affect the F-15C since both aircraft use the M61 Vulcan cannon, but this was not tested. I did not discover this tweak on my own, I merely followed someone else's advice on the forums and decided to upload it for those that may not be comfortable editing the file directly. The package includes OVGME and JSGME compatible packs, and each pack includes a version with only the tracers removed, and another version with the tracers removed and the smoke updated. Use whichever you prefer and have fun!