can anyone tell me what size the piping on the newage std system is did subaru stick with 2.5" or go to 3" on the newage cars?

as been under my car yesterday and the guy before me has fitted a 3" uprated newage system and i thought it was a 2.5" uprated classic system.

 

2.5", or that's what the backbox and centre section from my 07 wrx are. Just been out and measured them, as they're cluttering up my patio after having PPP fitted.