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With a complete exhaust system, yes. If you just bolt the SVT header into a stock exhaust system you won't see much of an increase.
 

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with those mods installed you would see an improvement, but if you have the stock cat-back, then you wont see much of anything until you get a cat back exhaust system. There is a thread where a guy has passed out a dyno of before and after with the svt header, you have to PM him for it though.
 
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