Hello, new Volvo enthusiast here. I recently picked up a beautiful 2006 s40 2.4i that had a blown head gasket. Long story short, head was determined by machine shop to be warped beyond saving. The casting on the head is 8642289 007. I am looking at a remanufactured replacement on Clearwater Cylinder: Turbo Head. The casting numbers match but they have it listed as a 2.5 Tubo head and their other non turbo head does not match my casting numbers: Non Turbo Head. Should I be ordering the turbo head? Are these compatible? I plan on bringing the car back to life and driving for many years and I do all my own mechanical, so should see me around quite a bit. Thank you!!