2004 Ski-Doo REV Series Factory Service Manual, Page 105Get this manual
Section 04 ENGINE Subsection 01 (593, 593 HO, 593 HO SDI AND 793 HO ENGINE TYPES)
TUNED PIPE
Identification
Each tuned pipe is identified by numberTo use the proper tuned pipe with the proper vehicle, check the number on the welded clamp at the end of tuned pipeThis number depicts the last numbers of Bombardier part number
Installation
Install doughnut shaped exhaust gasket no3 with both of its notches aligned with Y-manifold protrusionsIf the gaskets are damaged, replace themNOTE: No RTV sealant required on doughnut shaped exhaust gasketsInstall all exhaust springs
MANIFOLD
Removal
Remove: tuned pipe no2 doughnut shaped exhaust gasket no3 manifold screws no5 manifold no6 gaskets no7
Inspection
Check if the manifold is cracked or damagedReplace if necessary