this is tha crack

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full shot

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That's a crack alright, lol, but what I don't see is black soot seeping from it. Black soot on the exhaust tract is a tell tale sign of a leak, but there isn't any there.
Can you hear it leaking right there? If not, that's just an external crack that will eventually lead to it leak exhaust.
Is it me or is that crack going up to the bolt?

 

Is that just the heat sheild? I cant really tell from the picture

 

Nope, that's the exhaust manifold.

 

oh ok so those bolts are where the heat sheild would normally bolt into. I get it

 

so can that crack be the cause of my performance problems..today again i was in 4th pushing it to 5500 rpm and bam a loud pop then my check engine light came on...it came on before then i went to see what it was and they said it was o2 sensor can that cause major problems?please im tired of not being able to push my car past 4000rpm....so waht should i do...it cant be plugs..wires..maybe injectors??or fuel filter???or pump how can i tell..

 

I dont remember if you already gave us these, but do you have the codes from the CEL

 

it was a o2 sensor last time i cheked but ill get another one incase