The odd thing is that on the DC sports website they list the headers #HHC5018 (the one for the 98-99 4cyl Accord) as just that .... for the 98-99 Accord 4cyl. All the other headers are specified as for the 9x Accord EX.. 9x Civic SI.. ect. There is no specification as to model. I did not have any concerns until I went to order it and saw the warning. I sent an email to the DC sports Techs, but they have not answered....