Don't cut your pipes... also if you are on a mega budget take a look at Summit's house brand of chambered mufflers. They sound pretty similar to flows and their "turbo" mufflers sound similar to Magnaflows. There are clips on youtube of them. At any rate, throwing a set of good mufflers and an OR pipe on there is going to help with your sound wants. I would NOT recommend hacking up your exhaust in the meantime. Patience grasshopper...
An optimal combo for shorties and a Fox is:
FRPP Ceramic shorties (best shorties available by miles)
Your choice of stainless H
Your choice of catback.
I will say again, flowmasters drone like a mofo, you are going to hate life at 2200-2300 rpm on the highway although it will sound good at idle. Also, take a listen on youtube to sound clips of all different combos because there is a BIG difference between being loud and sounding good. Pretty much every swinging dick has flowmasters and an offroad pipe. Dare to be different! Or get the flows if you like them, your car.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.