Personally I wouldnt pay lexus prices for exhaust parts - find an exhaust place you can trust (Custom exhausts in Cardiff is the one i use) and have them do owhat you want.
In my case mine was blowing when I got it - they found that there was only one bolt in a two bolt flange - the joint had been plastered in exhaust paste - so they seperated it, cleaned off the old paste and applied a small amount of fresh paste and another bolt - all fixed up good as new for a wopping £10 !
Exhaust work doesnt have to cost the earth !