I need a complete replacement exhaust system on my 2004 SC430. Lexus have quoted over 3k. I have enquired locally about stainless steel replacements and although much cheaper, these are all quoted as cat back systems and I have had no replies regarding a full system. My problem comes from the leak being at the manifold point so I need a complete replacement rather than the cat back system. Also, I want the car to be as quiet as the original exhaust but there are opinions saying this cannot be achieved with stainless steel. Any suggestions please before I go ahead with the dealer option of a normal replacement.