the exhaust is cat-back, and gives a very nice sound indeed. You don't NEED to change anything else if you don't want to, the hi flow cats will make it even louder and slightly raspy. Some people said Nismo+hi flow cats = too loud for them, I personally like it!
Val ...I have a MillteK system fitted,its a bit quiet do you have same system on yours ? and also have you the decat pipes fitted as well??as this should make mine a bit raspier
agree the Milltek on its own is deep, quiter compared to the Nismo, but not quieter than stock.
I've added Kinetix Hi-flow cats and now it sounds awesome
Lokks like thats the way to go for me then Where did you get your Kintix from??