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Discussion Starter #1
just installed HS header onto a 97 se-r, motor started making weird noises but only when in gear, sounds like a air is leaking. everything was tightened and done right. engine light also came on after 25 miles or so???
anybody know what this could be?

TIA,
 

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Sounds like an exhaust leak. Just to double-check:
Pull the code and see what the error is.
EGR tightened on header
EGR tightened on other end
O2 sensor tightened
Re-torque manifold to 35 ft-lbs
Check primary-secondary connection and secondary-cat connection
Did you mess with the intake at all while doing this?
 
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