GT Performance Mods 2005+ Mustang GT Performance and Technical Information

Added the HiFlow Cats

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Old 12/4/05, 01:56 PM
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Ok, so for those of you who have been following my header/x-combo escapade...I decided to change it up.


To recap-
K&N intake
JBA shorty headers
Bassani Xpipe with removeable hiflo cats
no mufflers, straight pipes

At first, i had it with the off road pipes in.

Off road pipes

this morning, I replaced the offroad pipes with the hiflow cats. The best way I can describe it is...less raspy, just as loud, but a more muscly sound.

Hi Flow Cats
Old 12/4/05, 06:40 PM
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Sounds good. I've been thinking about going with x pipe for a while now but have been worried about how loud it would be with straight pipes. How big of a difference is there between shorty headers and the stock headers?
Old 12/4/05, 06:46 PM
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Sounds awsome! Thanks for the video.
Old 12/4/05, 09:41 PM
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thats more like it! I take it that you are pleased with the results?

-Dan
Old 12/4/05, 10:02 PM
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ooooo this is bad. They both sound really good, and I really like the rawness of the off road version. I think it is irritatingly loud in person though... its hard to tell from the video. My new concern is how much different the H pipe is from the X. This is an X pipe, and I REALLY like it. But I have heard H pipes i REALLY like. I think it depends on the video.

Dan, where in CA are you?
Old 12/4/05, 10:36 PM
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Originally posted by emperorjordan@December 4, 2005, 9:05 PM
Dan, where in CA are you?
Im in the San Francisco Bay Area and I roam the streets of San Mateo County. No other daily driven car sounds like mine around here.

-Dan
Old 12/4/05, 10:47 PM
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Nice, too bad you are way up there.... I really want to hear some setups in person before I buy.
Old 12/5/05, 11:13 AM
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after listening to the second video, I can now say it doesn't do it justice. its alot louder than it sounds on video.
Old 12/5/05, 06:44 PM
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Thanks for the vids. I have been saving up to get the hi-flow cat legs from Bassani. I bought just the off-road x-pipe without the cats because I was sure I'd want the offr-road setup. But, after having it for weeks now, I don't like it one bit. Way too much rasp. I think this car definitely needs cats. And those hi-flow cats really don't make it any less loud.
Old 12/5/05, 07:54 PM
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I'm with you, Ian. After reading/listening for some time now, I'm pretty much set on going with LT headers, catted X-pipe and my Loudmouths. I think the cats will provide just enough restriction to sound loud and muscle-car like!

Although running around with open headers like Dan did sounds pretty sweet too. ahaha
Old 12/5/05, 08:54 PM
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Don, I think that'll be one mean sounding setup.
Old 12/5/05, 09:08 PM
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I'll be sure to post up some video when I do it (which should be sooner rather than later).
Old 12/5/05, 10:01 PM
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I like the rasp, but want to cut down on the volume a bit... but I am all confused now. Too many good sounding choices. I am leaning toward the catted bassani, so I have the option of going catted or not.
Old 12/5/05, 10:59 PM
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you could always add in an electronic cutout pair if you really wanted that open header sound at the flick of a switch.

-Dan
Old 12/5/05, 11:03 PM
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Originally posted by Cleveland@December 5, 2005, 10:02 PM
you could always add in an electronic cutout pair if you really wanted that open header sound at the flick of a switch.

-Dan
That would be kinda James Bond-ish... hahah
Old 12/5/05, 11:15 PM
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Actually I made several posts about that over the summer becuase my friend did it to his 5.0. But is there room to put them BEFORE the stock cats? I would love that, keep what I have now and have cutouts. Even if it meant reflashing the tune when I opened it, still it would be an easy change. Would they fit tho?
Old 12/7/05, 09:44 AM
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Richard, is your straight pipe custom made?
Old 12/7/05, 09:58 AM
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yeah the "axleback" pipe and tip was custom bent. Cost me about $250.

I too have been considering cut outs...very useful for driving arround...and then makin it quiet to go in my neighborhood. I am gonna get the car up again and take measurements/pictures this weekend.
Old 12/7/05, 11:55 AM
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Originally posted by SurfnSoCal@December 7, 2005, 12:01 PM
yeah the "axleback" pipe and tip was custom bent. Cost me about $250.

I too have been considering cut outs...very useful for driving arround...and then makin it quiet to go in my neighborhood. I am gonna get the car up again and take measurements/pictures this weekend.
I'm interested to see the results. I've been wanting to do this but it doesnt look like there is enough room before the cats.
Old 12/7/05, 07:27 PM
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Anyone have more info (maybe a link) to electric exhaust cutouts? I've never even heard of this... sounds pretty cool.


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