One of the most difficult things to do on these cars is a nice sounding exhaust system.
Most people are going to argue that the only way to achieve a decent sound is with Borla S Types and BBK shortys.
And thats it....nothing else.
But I didnt listen to that....I didnt want to be like everyone else....I've spent either over a grand in exhaust parts or really close to it and yet the sound is still not exactly what I wanted but its getting there.
Current setup - Stock headers (for now - looking into BBK shortys), Lethal Performance H-Pipe with GT Resonators, Jones Exhaust 18" glasspacks on the Over the Axle pipes and Trident Motorsports for the axle backs.
I've had MAC axle backs, Stock GT Axle Backs, Stock V6 Axle Backs, Black Pype Bombs AB, Complete Muffler dump.......pretty much as you can tell its been a long journey trying to get this car to sound "decent". Still not quite there but hopefully I can.
To answer your question though.
Any good muffler shop will have piping to build a custom exhaust for you. Right then and there. Little costly but probably still cheaper than buying all bolt on parts.
You can order the parts you want and just bring it with you most shops will still do the job but they may charge a little more for labor since youre not buying their parts.
See my Baby Here
2012 101a Mustang V6 M/T 6-Speed