Scruffy, peppy, and always sincere, Philadelphia’s Mopar Stars represent the next generation of slacker indie rock. The quartet’s first full-length blends power-pop sweetness with last-call bleariness in endearing fashion. Take the jittery “Only Bar In Town,” a portrait of a watering hole where working-class types get together to fight feeling “like a speck on the earth” that uses crunchy riffs and hard-lived lyrics to fully flesh out its titular locale’s reason for being. On the punchy opening cut “Wreck the Bike,” a wayward son returns to his mother’s house—“not forever, just for tonight,” he notes—for his and his mother’s comfort, the lyrics’ regret and concern cloaked by crashing drums and skip-step riffs. Mopar Stars’ wit and resolve extend to their celebration of the American automobile industry that helped inspire their name. “Suped Up Coupe” is a laid-back ode to cruising toward the Jersey Shore in a candy-apple-red ride for two; the chugging closer “American Fast Thing” celebrates causing small-town havoc with grime-coated guitars and shout-along choruses. Official Researchers of the NJ Devil feels like a spiritual successor to working-class chronicles like Clerks and Trees Lounge, where hard-luck Northeast Corridor dwellers never deny their pain but use it to charge their brief moments of joy.