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Old 04-05-2009, 08:46 PM   #1
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Flowmasters

Hello.. I need some advice on the flowmater 40 series axle back muffler. I have a 2006 GT AT and want to purchase a new exhaust. My question is do I buy the 40 series 817460 or the 17410 which is closer to the toned down 50 series.. I havent heard either for real and need some direction from those of you that have heard both. Thanks.....
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Old 04-06-2009, 08:36 PM   #2
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Re: Flowmasters

I would say magnaflow. over flow master. But if i had to chose between those i would say. 40 series 817460
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Old 04-06-2009, 10:09 PM   #3
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Re: Flowmasters

Thanks for the info. Never really considered the magnaflow. Have you ever hears the 40 series flowmaster on a GT AT? How loud are they actually.
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Old 04-07-2009, 09:34 AM   #4
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Re: Flowmasters

I had the 40 series on my car and they are IMO the best sounding muffler on a near stock mustang. the only problem with flowmasters are they tend to rust out on the inside and the chambers break loose on the inside and rattle like hell. mine lasted 3 years before the drivers side broke. this can be worse on the axle backs because people for some reason tend to spray water into the tail pipe when washing the car.
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Old 04-07-2009, 09:35 AM   #5
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Re: Flowmasters

also I have a friend that has a good used set for sale. his screen name on here is (07stang)
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Old 04-07-2009, 04:11 PM   #6
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Re: Flowmasters

I bought a 97 Cobra that had 40 series on it with a BBK x-pipe. The inside of them were rusted out all the way. I put 40 series Flows back on it and am very disappointed, they are loud and tend to rattle new. It may be the pos BBK x-pipe or it may be that it is a 4-valve motor. The Flows sounded good on the pushrod motors (95 and down) that I can remember. Also my tuner said that they don’t improve, I don’t know if I believe that but my choice would be Borla, or Magnaflow. I am going with Kooks LT headers, w/ Kooks offroad-X, no cats, and Magnaflow mufflers. The Flowmaster may be good on the 05 and up, put them on and if you don’t like them its nothing a couple hundred can’t handle.
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Old 04-07-2009, 05:28 PM   #7
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Re: Flowmasters

The rust issue is why i said magnaflow. Probably shoulda mentioned that when i said it. Dont get me wrong the flows sound good but i dont wanna change my mufflers every couple years.
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Old 04-08-2009, 04:36 AM   #8
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Re: Flowmasters

Rhanks for the info. Im new to this ehaust thing and didnt even think about the rust factor. Like you said, try em and see. I do plan on buying a 2010 at soepoint but have the winter blue and wanna get out and play again. Thanks again.
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