90-93 integra is slightly shorter & the exhaust hangar setup is different between 2nd & 3rd gen integras
DC also does not recommend using the 90-91 header on a newer B series motor. If you google around you will see the header for a 90-93 RS/LS/GS has a different part number than the one for a 94-01 RS/LS?GS
Then GS-R Integras have yet a different part number than any of the other models...
90-93 integra is slightly shorter & the exhaust hangar setup is different between 2nd & 3rd gen integras
DC also does not recommend using the 90-91 header on a newer B series motor. If you google around you will see the header for a 90-93 RS/LS/GS has a different part number than the one for a 94-01 RS/LS?GS
Then GS-R Integras have yet a different part number than any of the other models...