The NYPD is offering $2,500 for information leading to the arrest of the gunman who killed rapper Chinx in a drive-by shooting, ­police said Wednesday.

Chinx, real name Lionel Pickens, 31, was shot 15 times on May 17 as he and a pal sat in a silver Porsche on Queens Boulevard in Jamaica. The pal, shot twice in the back, survived.

According to cops, a lone gunman pulled up next to the Porsche, opened fire and sped off.

Relatives of the rapper told The Post they believe the killing was carried out by a rival from Far Rockaway.