I have a problem with my h22 and i dont understand what happend. First of all, i swap the h22 and it start well but its running at +-1500 rpm. After, I install my exauhst to my downpipe ( apexi catback). Then i try to start my car to ear the sound of the exauhst and it didnt start when i try more than 10 sec to start i can see gaz between the header - downpipe and downpipe - cat Some one tell me maybe there is too much gaz. Any help?