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Discussion Starter #1
I know it might be a stupid question but the TSB. Ford put out is 2nd guessing my heartthrob h pipe upgrade (cat back) I know its going to let the 5.0 breath better but is letout too much back pressure ? I haven't read anything about people having issues with a cat back system .. just want to make sure I don't damage my GT/CS
 

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It wont hurt a thing.

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no it wont hurt.:bigthumbsup Youll gain horsepower but possibly lose torque. you should get it tuned to adjust to the better airflow
 

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He wont need a tune for a cat back. It would be a waste of money.

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Discussion Starter #5
I'm avoiding tunes... For the time being b/c of the 8 cylinder issue.... I just looking for deeper rumble .. I've added a roush axel back ...
 
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