Cat-forward or cat-back?

[juicebox00]

just find a muffler you want and get custom single piping.

 

[NashvegasCG]

Have you searched?

have you

 

[NashvegasCG]

Molds? The manifolds are probably machined from a piece of billet steel. If you know anything about computer numerically controlled machining, you'll also know it's the most accurate way to shape metal with tolerances as small as .001"

I don't know anything about it, thanks for the info