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Well i put 2 flow 44's on my 02 gt and it sounds great. Really growls and sounds mean at around 2400 rpm, but i can cruise on the freeway or sit at idle with just a nice deep humm.
Hope this helps! Ohh, and i got mine on craigslist for 40 bucks, installed em myself so i think it was worth it!
My recommendation would be something cheap similar to the original. I went as cheap as possible with a glasspack. Youtube 2.3 Mustang exhaust and you should be able to get a few ideas.