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In all honesty.... with a cat back system. on that car... since its not a big V8 trying to breathe through a small pipe... i honestly wouldnt expect more then 5hp gain. All the aftermarket exhaust people will say oh you will get 15-20hp increase but its all bullshit. no way you will get that much more power from it on a otherwise stock car. Dont get exhaust to gain power its a waste of money. get the exhaust to change the sound to something you would like or... just to replace the old crappy stuff. You wont notice the diffrence from it and if you do.... well be happy for the placibo effect.
Now if you had say a big block car trying to breathe through a single 2 1/2 inch pipe... then you could expect that horsepower increase you would feel. Even a small V8 changing from single to duel exhaust would be noticable. but changing out a muffler and putting the same size pipe on and only doing cat back... dont expect much. most likely the most restrictive thing in your exhaust is the cataltic converter.
But as far as brands go... i have always liked the sound of flowmasters. Just need to make sure you get the right one for what you want. Call them up and tell them exactly what you have and what you want it to sound like and im sure they can suggest a good one.
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