Originally Posted by eddi3B.
The berk sounds real good. I'm looking for a dp now.. How can u compare that to the ar 4" catless?
they're both reputable companies -
fitment is good, performance is a +.
The DPs for the N55 have done their job eliminating
the set of cats on the 335i models.
u'll be good with whatever you choose.
good luck with the new power mod.