I have a 98 300ex i bought used about a month ago i ordered a e-seriers exhaust head pipe k&n and main jet. i put all parts on but jet had not come in and it was a hudge gain but when my jet got here it was a 135 stock is a 122 so i complaned and they sent a 130 but when i put it in i saw no diff in performance any help or recomendations.

 

go to a local dealer and get a differnt sized jet