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FiTech Fuel Injection Retro LS Complete Self Tuning Induction Systems for LS engines designed for the do-it-yourself Hot Rodder to the professional EFI tuner! This system is ready to go with the needed wiring harness and sensors to get you on the road easily and faster than any system on the market today. Forget sourcing mismatched parts and cutting and splicing old harnesses and re-flashed ECU's from "Craigs List" tuners. FiTech's Retro LS is a complete throttle body kit, suitable for that junkyard 5.3 to a stroker 427, we have you covered! Check out the list of features and you will wonder why it's never been so simple to ditch that old factory hardware or top off that fresh long block and give your LS swapped vehicle look that old school carbureted look with the EFI technology and reliability.