muffler exhaust

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I need to extend the exhaust pipe on a 30 hp engine (Briggs & Straton) which operates a 15KW electric generator. The muffler output is 1.5" OD; I plan to use a flexible SS adapter to connect it to a 35 ft. run of 2" dia. pipe in order to carry the fumes out of the garage and over the top of the house. There will be a total of 5 bends (10" bend radius) in the pipe run. Is this allowed? I can't find any guidelines on the matter by the manufacturer. What is this going to do to this engine? Thanks, crespo65@msn.com