[jnic290]

So I just agreed to terms on a '13 328 and found out that it has the N26 SULEV engine. I'm looking to do some mods in the not-to-distant future and came across an awesome write-up that was done on Evolution Racewerk's 328. The article prompted me to check into downpipe options and I'm reading all of these product pages saying that they don't fit the N26. Does anyone have any idea why this is? Also, I'm trying to understand whether I would need a catted downpipe -- I do plan to use the car as a DD and live in Pennsylvania. Any advice would be much appreciated.