+1 if you run a muffler delete and longtubes with a o/r midpipe it will be really obnoxious sounding but with the cats it will sound much cleaner.

Pypes delete mufflers, actually just straight Stainless Steel pipes, loud and no drone, love mind on my GT/CS

cats are for "kitties" if you catch my drift if your state doesn't require them then don't bother. performance hinderence, stlwagon almost lost his engine cause one of his "high flow" cats clogged.

If you are looking for the loudest, most obnoxious sound on the block then you should go with long tubes, an O/R H-Pipe, and a muffler delete axle-backs. The resonated ones are even louder and more obnoxious (like my boom tubes, others might be close but not quite as loud). Cats will make it sound "smoother" but not as loud.
Silly wabbit, CATs are for kids

If you want deep, my set-up is Kooks 1 3/4" LT's, 3" catted H mid-pipe and FRPP stinger mufflers.....Here's 2 vids so you can hear it.

This one is audio only

YouTube - Kooks-audio.wmv

And this one is in-car video..

YouTube - Kooks-in-car.wmv

I can't imagine what it would be like without cats.

ok so if i do the math long tubes + O/R midpipes + a non-catted exhaust = the sound im looking for

that is pretty loud its without a doubt louder than my neighbor and it looks like ill be goin without cats thanks for the sound bit

O/R midpipe is a non catted exhaust. Did you mean an o/r midpipe + a straight through exhaust like stingers, magnapacks or bassani? Just a word of warning. If you run an o/r midpipe + a straight through axleback, you will get trumpeting, which is this blaring sound, at part to full throttle around 2500 RPMSs. Some people like it-most don't. If you add resonators, it will reduce or get rid of the trumpeting while cleaning up the sound. It will quiet the exhaust a little, but the overall tone will be better.

electronic exhaust cutouts. my teacher put them on his 06 gt eleanor and they sound crazy. i plan on buying a set from AM for $430 in a few weeks for my 87.

the cutouts will allow you to run the exhaust as quiet as stock and you can flick a switch in the car and run the car with open headers. i think there great for a loud exhaust and to have the ability to quiet the car down at night to keep from waking up my neighbors. not like i car about waking people up but its pretty cool to have the flowmaster setup and the straight pipe setup on the same car.

thanks for the clarification i was kinda confused so i should add a straight pipe with resonators ?

Straight pipes i.e, muffler deletes are different than straight through mufflers i.e, stingers, magnapacks. Here a few vids:
YouTube - Mustang GT, Kooks long tubes, Borla stngers, 18 Dynomax resonators, Offroad X pipe.wmv

YouTube - Mustang O/R x and glasspacks revs

Glasspacks and resonators are used interchangeably

MACs also sound awesome. They are not a straight through design, but they are still pretty loud.
YouTube - 2007 mustang gt mac o/r h exhaust
YouTube - full mac exhaust 2