I don't think it's the hose with only 6400 miles is the problem!!...Sounds like the system has a air pocket...I would drain the system & re-fill it again! ...Re-use the same coolent if you'd like with that low of milage...
I felt the Spec clutch & wasn't over impressed! ...as far as feel, about the same as a OEM Cobra clutch...trust me Centerforce DF feels a ton lighter! :headbang: