Unless Toyota has changed their policy MRT100 should be OK.Years ago I had a Tercel with an exhaust that was replaced by the dealer. After that one rusted out, I called and had them replace the exhaust. When I called I told the service guy that it should be a warranty replacement. When I picked up the car they still gave me a $200+ bill. I then showed the service guy my old receipt. Nothing else was said parts and labor were covered.

Last year I replaced my catback Jardine with an OEM for my T. I called around to three stealerships in my area and picked one up for $115.00.