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I have 2012 mustang gt with roush stage 3 supercharger just wondering if longtube headers would make a big difference in the hp.
 

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May get 20-25 hp out of Lt's,..................if you're running the Roush tune, a custom tune would wake your GT right up..
 

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You would need a custom tune as the Roush tune won't work. Might be worth 20ish horsepower. That's a lot for the cost of them plus installation.
 

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It’s not all about the HP. LT headers move heat out of the engine faster.
 
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