I replaced the catalytic converter in my 2007 GS with the magnaflow high flow cat setup. went to start it and it will crank but will not turn over. spent the next two hours going over the engine to see it something was disconnected or damaged and found nothing. checked the plugs for fowling and spark (couldn't find a good enough ground for the plug to arc, also found nothing. checked the seal between the block and the header had no leaks that i could find. Please help i NEED my car for work. someone help

Cars & Trucks - Mitsubishi - Eclipse - 2007 Mitsubishi Eclipse