I had the same mentality as you when I got my Cobra. I didn't want to get Flowmaster because everyone on here said they were crap. I decided to get Bassani o/r X and catback because everyone said that combo sounded good. I hated the sound of it and wanted that chambered sound that people associate with Mustangs. A couple of months later I switched to a UPR o/r X and welded in some Mac mufflers.
Everytime I hear a Mustangs in person or on a video with FM's it sounds damn good. If I ever need to replace the Mac's I'll probably just get the super 44's because they sound very close to Mac. Get what YOU think sounds good.
Dude I felt the exact same.. Regardless of how much flowmasters cost, or how many people have them, they sound good on a 4.6.
This is my old GT with 40 series flows and a mac o/r prochamber:
http://www.youtube.com/user/neilgoodin#p/u/19/3MhLChRQW08
Here is that same car with mac o/r prochamber and magnapack catback:
[ame="http://www.youtube.com/watch?v=jt6ak83KI_o"]YouTube- Magnaflow magnapacks, prochamber and LT's 03 GT[/ame]
My cobra has magnaflow catback and an o/r X, but it's honestly just a hair too quiet for me..
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