Hello. How can I check to see if my exhaust system is clogged or restricted?

This engine is low on power. I'm checking all the other likely culprits but would like to rule out some sort of exhaust system restriction.

Any helpful ideas are appreciated! Thanks.


rr

1984 300TDT
262k miles

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'85 300SD 193k miles (parts)
'81 300SD 400k miles-sold
'84 300SD 205k miles-sold
'84 300TDT 270k miles-sold
'80 300CD 200k miles-sold