Add to Cart The item has been added BorgWarner EFR Series 6258 .64 A/R Turbocharger (225-450HP) The EFR line of turbochargers was born out of an internal BorgWarner Turbo Systems program labeled Advanced Aftermarket Products or AAP. The program was engineered by a cross-functional team that began with the proverbial clean-sheet of paper. No legacy... $2,198.35 Add to Cart The item has been added Compare