Hi, so i have been reading up on these aftermarket boyesen exhaust flanges and they say that only the 04 did not line up but the 02/03 matched the port perfectly. I understand that 02-04 CRs pipes go over the flange with the newer ones go in(05-07), as i have both. So since the 02-04 are all a 3 bolt pattern to put the flange on the cylinder. The 04 flange don't match the port perfectly effecting low end. the port is a D shape on its side while the flange is perfectly round causing almost 30% blockage(i read). Since these years are so similar would it be possible to get an 02/03 OEM flange and put on the 04 cylinder to get rid of this "blockage" . Or is the bolt pattern or the angle different? Thanks ahead of time for any responses!!