Thats a lot for an exhaust, not had the issue on the Rav4 yet, only had it a week, but the local powerflow place did a full cat back s/s exhaust for my previous 4x4, custom to my requirements, and has just done one for my sons kit car, (twin exit, manifold back) and I still would have had change from yours. £350 for mine and £300 for my sons and they are lifetime gaurantee. Trev