I think i may have screwed myself.

i installed a S/C, and ultimately would like to get the 7th injector as well. but i have read that the 7th injector can only be installed on cars with dual catalytic converters, whereas i believe my car (2000 runner) only has a single. so i thought, no problem, i'll just convert it, and bought the dual cat headers, and will have a custom exhaust shop put on the dual cats with the exhaust.

i didnt even think that maybe the dual cat headers will not match up to my engine. any ideas??