So this guy is going to sell me his N1 muffler with some piping for 80$ said it came off his 240sx, 1 will that muffler be ok for my EJ8, 2 I asked him to snap a pic of the tip where it would say apexi he said that they had to take off the plack to mount sideways on the 240 how do I know he's not giving me a knock off N1 style and is there ways of telling it's a legit N1 besides that