How to 3D Model one of these DXF Rotax Y Pipes, and Exhaust Elbow???

I need the 582 Y Pipe 3D modeled, but want to do there others also eventually. Can someone do a How To in Solidworks, on doing one of these Y Pipes! Thanks.

These Rotax Files at above web address:

Exhaust manifold assy. 973 122 for ROTAX 582 UL DCDI model 99 (27 KB) 973122.gif (21 KB)

Elbow (18 KB) elbow.gif (11 KB)
Exhaust manifold assy. 979 380 for ROTAX 447 UL SCDI (42 KB) 979380.gif (20 KB)

Exhaust manifold assy. 878 936 for ROTAX 503 UL DCDI (48 KB) 878936.gif (20 KB)

3D Modeled in Solidworks

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