GT Performance Mods 2005+ Mustang GT Performance and Technical Information

Magnapack installed

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Old 9/10/08, 10:37 AM
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Magnapack installed

I installed my magnapacks lasts night, well at least the axlebacks. I am using the stock H-pipe for now. I might install the midpipe this weekend. With out a lift, install was somewhat a PITA. Since I couldn't loosen the midpipe, getting the axlebacks on was a hassle. The sound is awesome. Deeper and throater than my JBAs but I don't think the magnapacks are as load, but that may because they are not broken in yet. Drone/resonance is not as bad as I thought. My Flow 40series was worse.
Old 9/10/08, 11:04 AM
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Awesome! Can you get a sound clip or Video?
Old 9/10/08, 11:12 AM
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I have lt's, an offroad H, and 2.5 inch magnapacks, and I couldn't agree more. They sound great, and surprisingly, for a strait through design are relatively quiet.

Have fun!
Old 9/10/08, 11:23 AM
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I assume they get a little loader after 500 or so miles. But nonetheless they do sound awesome.
Old 9/10/08, 04:49 PM
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congrats and if you can get a clip up even better
Old 9/10/08, 07:28 PM
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Nice!!
Old 9/11/08, 11:17 AM
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Originally Posted by gmantheman
I assume they get a little loader after 500 or so miles. But nonetheless they do sound awesome.
Yup, they will definitely get a bit louder as you drive them more.
Old 9/12/08, 01:49 AM
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Glad to hear you like them so much.

The JBA's were louder in this test:
http://ten.ewzone.com/articleImages/37505.jpg

source:
http://mustanglife.tenmagazines.com/...ticle&aid=3827
Old 9/12/08, 07:45 AM
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I don't recommend the Magnapacks with FRPP shorty headers.....WAY too much resonance @ around 2500rpms IMO. I sold them to my buddy with stock manifolds and they sound great.
Old 9/12/08, 07:53 AM
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I had the magnapaks and you will find that they won't get much louder as you put more miles on them. Which is why I went with FRPP. The magnapaks just didn't have a deep enough tone. However, they sure do look nice.
Old 9/12/08, 10:41 AM
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Post a soundfile or vid if you have a chance.
Old 9/13/08, 06:55 PM
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I got around to installing the cat-back portion and re-installing the axlebacks. Not to sure if it made that much of a difference in sound, but fitment was no problem. Install took about an hour or so. I will try to post a vid as soon as I can find the cable that connects the camera to the PC
Old 9/13/08, 06:56 PM
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Originally Posted by adrenalin
I had the magnapaks and you will find that they won't get much louder as you put more miles on them. Which is why I went with FRPP. The magnapaks just didn't have a deep enough tone. However, they sure do look nice.
I think the maganpacks have a deep tone compared to my JBAs and 40 series flows.
Old 9/14/08, 06:47 PM
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Originally Posted by gmantheman
I think the maganpacks have a deep tone compared to my JBAs and 40 series flows.
For sure. Two totally different exhaust setups (magnapacks to any chambered exhaust).
Old 9/18/08, 10:46 PM
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I know on stock S197s catback systems are supposed to give minimal hp/tq gains, but my car does feel more responsive, especially in the lower RPM ranges. Could be a placebo effect.
Old 9/19/08, 10:19 AM
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Originally Posted by gmantheman
I know on stock S197s catback systems are supposed to give minimal hp/tq gains, but my car does feel more responsive, especially in the lower RPM ranges. Could be a placebo effect.
Well take into account backpressure - when I changed my midpipe from stock, I could tell the difference down low from when I had my Corsas on (straight throughs) to a chambered unit (Hooker aerochambers) - the car had a bit more ooomph down low with the Hookers as oppsoed to the Corsas
Old 9/19/08, 12:03 PM
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I have read about the back pressure effect but never paid much attention to it. But I believe that the car does accelerate faster because of the back pressure.
Old 9/19/08, 01:04 PM
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A couple very short sound videos. I'll post some better ones when I get the car back,These are some older videos,but it is the Macpacs with custom exiting exhaust.




Holding camera and driving ,so I didn't rev it to much through the gears.
Old 9/20/08, 11:45 PM
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I don't know if I like the red/yellow combo or don't. Overall it's an awesome looking car. Thanks for the posting the sound clip.
Old 9/22/08, 06:51 PM
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Originally Posted by gmantheman
I don't know if I like the red/yellow combo or don't. Overall it's an awesome looking car. Thanks for the posting the sound clip.
No problem,One correction its Red with kandy gold stripes not red and yellow,some like it ,some don't. I'll be changeing the color on the car during the winter months, But in away I regret it because I've gotten sponsorships and have won 1st place in National car show events with this combination!But since the car is going to be the offical demo car for T3 Audio,the color will be changed. I'll be posting the new interior look in two to three weeks! I've been without the car for a while ,but custom one offs take time to get perfect.
Like I said before the videos are just examples,I was holding the camera and trying to shift gears,so I didn't get on it to really be able to hear how loud it really is,plus it sounds alot different after the Higgings tune.

Last edited by flamin ponyexpress; 9/22/08 at 06:54 PM.


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