Have a crack in my manifold

[jabran200]

Hi guys i have a crack in my manifold, it's about 2 inches+ long and about 1.5mm wide and has branched off a little as well. Basically what problems will this cause? loss of power,crap fuel consumption etc. I can actually hear a deep blowing type sound coming from the front in around 3000-4000 revs in most gears.

Gonna replace it on Sunday but just want to know what kind of problems it will give as its feeling a little slow these days. (1.0 by the way 1996)

 

[whipit]

Before anyone moans its obvious i just like to check, exhaust or inlet manifold??

 

[jabran200]

exhaust lol. thought i missed something.