My brother just bought a TA and has a catback exhaust system and wants to know how to make it louder?

 

Where the passenger side exhaust meets the Y connection before the muffler there are three bolts holding it on, here is a pic of mine.
Remove those bolts and there is a blockoff plate in there, the system comes with four plates ranging from a complete blockoff to wide open holes. If he didn't get those with the car you could make them pretty easily out of some sheetmetal using the one in the exhaust as a template.

 

What about with no plate at all

 

you cant have no plate at all, its like a spacer. if you put the biggest plate on it sounds kinda raspy . put the next biggest 1 in, with no cat its really loud....

 

It's still pretty simple to make, once you get the passenger side pipe unbolted just take a small piece of sheetmetal and trace the shape of the flange, cut it out and drill the bolt holes. You could make the size of the center blockoff hole any size you want. Or I'm sure he could order a set of four plates from Borla or one of their vendors. I would guess they would want $20 or so for the set.

 

It's $35 a set from Borla. I asked.