On the DC sports page. it says:

1994-97 Del Sol VTEC / 1999-00 Civic Si --> HHC5504 --> $395.95
1994-97 Del Sol VTEC / 1999-00 Civic Si --> HHC5604 --> $395.95

Notice they are the exact same BUT the model numbers on them are silently different. Both are ceramic headers. Does HHC5504 mean it's 4-2-1 two piece and HHC5604 means it's 4-1 one piece design or opposite or what? Someone please help me as I am waiting to buy a header for my B16 and wanan know which is which. of course I'm looking for the 4-2-1 two piece ceramic header. Just dunno which one to buy.

 

My Ex bought a DC sports and she and I both felt a loss of low end torque. But I believe one is a JDM 4-1 and the other is the two-peice 4-2-1.

 

Oh really? maybe she got you the JDM 4-1 cause 4-2-1 should be good for low and mids sometiems loss in highs while 4-1 is mid and highs supposedly.. soemtiesm loss in low