just bought a fab gs430 v8, but has the common leaky cat problem (centre, rearmost one). Its blowing badly and is useless! Is the ls430, pre and post facelift unit the same as the gs430? or perhaps the sc430 or even the gs300? having trouble sourcing a breaker, some ebay sellers in america may be able to help, but the postage and customs charges will be high! Please help!