wut do you mean the back end. and the reason they change the b-hosuing is so that you dont have the clutch line on the echasut side remember SR5's are non cross flow head and the clutch line runs along the driver side. so unless you wanna risk warming up your clutch fluid and burning up your line then i suggest you get a GTS bellhousing) and move everything to the INTAKE SIDE. just a suggestion. and for 600 bucks do you get an ECU, harness, and all accesories? i would rather pay 200 bucks for a front clip that i know has everything i need