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ive just replaced my exchaust manifold with Bad MAR headers Perfect swap.
im still having a small leak only when im starting my car up nd pressing the gass pedal, and when im crusing down the road at a steady speed of like 60MPH u dont hardly hear it only when i accelerate. im guessing i didnt tighten down all the 10 bolts enough. idk and their is a bad vibration thru my car as well..... any help here??.
My exchaust flange has bein repalced if you want an idea of what i mean, look at my albums and ul see my headers i swapped.
 

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Start from the middle and torque outward. Notice these are inch/pounds not foot/pounds.

 
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