How do you know if its a mod or lim pipe?

[wjelmer]

I have a factory B Pipe. How do I know if I have a Mod or limited chamber?

Sorry I know this is a noob question and I searched but could find a answer

 

[mike b]

I used to look if there is a weld mark on the chamber where the mod chamber is shortened. But I also found out newer model don't have this weld (something I've heard never researched)

 

[Harbor]