Renault Dealer Used Car Warranty What it covers??

Does anyone have any experience of the Renault dealer used car warranty??

I have had my 08 197 about 5 months now and I believe the exhaust has gone at the manifold. It was supplied with what they called a comprehensive Renault used car warranty. I am just wondering if this will cover the manifold. To complicate this further the dealer has already worked on the exhaust. Less than 24 hours after buying it the exhaust flexi pipe burst, they covered this no problem and had the flexis repaired. Previos experience with dealers has told me to expect the worse. Does anyone have any experience of this??