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After I did my muffler delete on my 02 F250, I just put a turn down exhaust tip right where the muffler was. Anyways the CEL light comes on for about 20 seconds when I gun it to about 90 MPH. I put the muffler back on and the CEL would not come on after the same scenario. Any ideas?
 

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Your engine isn't seeing the right backpressure... my does the same thing.
 
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