exhaust leak

[eric4g63]

So I have a 1g manifold that's got quite a few cracks in it some small one big one and I'm curious how much this is affecting my cars performance it's runs fine . It has a occasional miss to it when car is idling but that's all

 

[92AWDHX40]

Any pics, the missing sounds like more of another issue rather than a exhaust leak, ive had leaks car never missed. You say leaks how big, pics would help. Try the plugs, wires, coil pack if its missing.

 

[mavericktsi83]

If the crack is causing an exhaust leak then yes it is effecting performance negatively. If its not, its only a mater of time before it begins leaking...I would begin to look into a replacement such as a 2g or EvoIII mani and do some porting right away while your at it.