+1 those two will give you what your looking for.

 

4.10's and Longtubes, off-road x pipe, and SLP LM1s if you like loud. if you dont, check youtube/streetfire out for some clips to find something that you like. then after you got some of that stuff, get some lowering springs and rims. that will make your car an awesome street stang.

 

im with sxynerd, gears and exhaust will get you what you want. As far as exhaust goes it sounds like you want a chambered muffler like flowmaster or MAC with a high flow mid pipe. If its in your budget I would suggest a set of Long tube headers (to crank up the volume and get a few more horses).

 

Yup gears and exhaust

i suggest an O/r H pipe with either a flowmaster catback or Mac catback or a bassani BX catback

and 4.10 gears and you'll be ready to go