does anyone know if a 4-2-1 header from a 94 Integra will fit a 92 LS integra?

 

The header will physically fit and bolt on. However, I do believe the length of the bottom portion will not match up to the specs of your 1992 Integra. The catalytic converter might be a different length. Would be a simple matter, otherwise, to weld on a piece of extension pipe or shorten what you have now.

Check on that first. But yes, it will bolt up to the head fine.