so after searching i came down to 2 type of cat(94106 - 94166 ) base on the spec of the 2 i found( 94106 and 94166 ) it pretty much the same beside the 2 o2 sensor spot. smsp stated in the following link he use these two for obd1 n 2 for gsr 99 n under. im assuming 94166 is for obd2 base on how he word it but can someone confirm this? from my understanding these are universal cat and since they have the same spec it shouldn't matter which one i grab?

Cats (Catalytic Converters) with Higher Flow - Team Integra Forums - Team Integra

i currently have the rmf rep header and apexi ws2 cat back on a 1998 gsr. currently running the test pipe that came with the header but i want to put a high flow cat. so i just want to confirm if 94106 n 94166 is the same beside for the extra o2 sensor spot regardless it obd1 or 2.
ALSO for people who want to know my goal....for the time being this car is a dd car. i dont know if i have any future plan for it or not unless the engine show a good compression n leak down test. car at 121k.

94106
INLET: 2.5in.
OUTLET: 2.5in.
CONFIGURATION: Center/Center
BODY SHAPE: Oval
BODY LENGTH: 9in.
WIDTH: 6.5in.
OVERALL LENGTH: 13in.
FEATURES: Short Oval; 6.2L/6000lbs. EPA; 2.5in. Inlet/Outlet, 9in. Body; 13in. Overall; 6.5in. Wide

94166
INLET: 2.5in.
OUTLET: 2.5in.
CONFIGURATION: Center/Center
BODY SHAPE: Oval
BODY LENGTH: 9in.
WIDTH: 6.5in.
OVERALL LENGTH: 13in.
FEATURES: Short Oval; 6.2L/6000lbs. EPA; 2.5in. Inlet/Outlet, 9in. Body; 13in. Overall; 6.5in. Wide; Dual O2 port