Screamin Eagle Thunderheart Throttle Body Performance Harley 52mm FLH SOFTAILScreamin Eagle Thunderheart Throttle Body Performance Harley 52mm FLH SOFTAIL This came from knievel choppers, thinking they bought it for one of the choppers, looks like the screamin eagle throttle body 58mm kit but its only 52mm they used thunderheart ignitions. Maybe a prototype??? If you know Im real curious, had it on the shelf for along time beautiful just to look at!! selling as pictured. more than welcome to pick up at shop in Butler Pa & save