I'm getting ready to do a B18B1 swap into my '89 Integra, but I need a little more info for the exhaust. I've talked to people who have done B16/17/18C swaps and they had to get their exhaust extended 3" to mate with the header, factory and aftermarket. What I want to know is whether the LS and GSR headers are different lengths. What about between 90/91, 92/93, and 94+? I know the 02 sensor locations are different for different chassis, but are they otherwise the same? Would it be best to go with a B1 header and just extended if needed?

 

 

That gives me hope that the stock B1 header will reach. Anyone know if the 90/91 and 92/93 LS header is any longer/shorter?