Hello I'm having a problem with my 92 civic with jdm gsr swap. I installed a apexi header in but the header didn't connect to the stock converter so I drove down to muffler shop so that they can connect the pipes together. When I was leaving the car began to lose power starting in first and then second later that day I could only drive in third gear. I'm thinking I may need to go with a hi flow cat converter car was running nice before I connected the pipes. Anyone with any input I woulded highly appreciate it. Thanks for your reply. P.S I have a apexi catback exhaust but never changed the converter. Thanks.