Civic exhaust makes a hissing sound

[JimNZ]

My 1996 Honda Civic VTi started making a sort of hissing sound from the exhaust a few moths ago.
It is fine at idle but very noticeable under load.
This car is in New Zealand & I'm pretty sure it does not have a catalytic converter.
I thought perhaps something in the exhaust system has broken / partially blocked the exhaust.
What ever it is, I think it has affected the cars top speed, it seems to struggle to get to 140 kph.
It may also be affecting fuel economy.
Any thoughts would be appreciated.

 

[CO671]

Any CEL? Where in the exhaust? from the tailpipe, along the piping, or at the exhaust manifold?
Can you take a photo of the exhaust manifold?

 

[JimNZ]

Hissing exhaust

Noise is at tailpipe at rear.

Standard exhaust.

 

[R3dline]

that would be called a exhaust leak, you have a crack, or bad exhaust gasket somewhere.

 

[JimNZ]

That was the first thing I checked for. No leaks.

 

[R3dline]

if its hissing, you have a leak, exhaust doesnt magically make hissing noises, unbolt the whole thing, pull it down, and check it. there is a crack somewhere, or a rust hole.