#18366, "RE: FS. Apex'i N1 silencer for 2gnt... obviously." In response to Reply # 2
it is for the Apex'i N1 catback for the RS and GS. The piping is all 2.5, but it goes in the tip which is 4" (I am pretty sure 4"). If you have a N/A car and have the Apex'i N1 single tip, this will fit.
#18599, "RE: FS. Apex'i N1 silencer for 2gnt... obviously." In response to Reply # 6
This is about right for one of these. I paid $60 for my silencer(HKS Hyper..same thing as n1 basically). Someone who needs one, or will need one should get this.
"If there is nothing mechanically wrong with you're DSM, then there is something wrong with you're DSM"