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1-2 or 2-3, it's still within the error margin of any dyno...
 

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yeah, definitely NOT much... I got mine installed after driving and breaking the car in for 1300 or so miles... i really didnt' feel any difference at all. If there is, its only low end... and definitely no more than 3hp. Sounds great... but i will be going with a different exhaust system when they come available.
 
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