ok i own a '94 GS-R and plan to do the DC Sports JDM 4-1 route. so i PMed smsp and got this response back with prices. and when i read it i just got confused because it talks of jdm b-pipe/usdm b-pipe etc.

which one of these goes to my 94 gs-r? and what else do i need beside the cat and header to bolt up to my stock exhaust for now?

JDM Header

OBD I Bolt In $145, for 94-95 GSRs, or any car using a JDM length B Pipe (12" cat)
OBD II Bolt In $165, for 96-99 GSRs, or any car using a JDM length B Pipe (12" cat)

Base cat is a 2-1/2" Carsound 93506

OBD I Bolt In $165, for 94-01, RS, LS or Type R Integras, or any car using a usdm length B Pipe (17" cat)
OBD II Bolt In $185, for 94-01, RS, LS or Type R Integras, or any car using a usdm length B Pipe (17" cat)

Base cat is a 2-1/2” Carsound 43006 or 43036 (OBDII Compliant in CA)

OBD I Bolt In $240, for 94-01, RS, LS or Type R Integras, or any car using a usdm length B Pipe (17" cat)
OBD II Bolt In $250, for 94-01, RS, LS or Type R Integras, or any car using a usdm length B Pipe (17" cat)

 

so...anyone know?