Original front exhaust section connection 1.6, 2011
 

https://cimg8.ibsrv.net/gimg/chevrol...fc65b6dffa.jpg

This the the front exhaust section to cat connection. Any ideas about taking it apart to fit a new section? 1] no bolt/nut assembly 2] hex slot over-rusted like threads. Could i hacksaw through the join with the gasket? Any drilling is going to need a carbide drill bit. Any ideas please from experienced forum members would be welcome, thanks john