Without a Pre Cat

[Afishermany]

I own a 2000 Mazda protege with a 1.6 i want to but some aftermarket headers on it but it folds around the engine taking out the space to use my cat i was wondering if my car wont get messed up due to the fact that it needs back pressure as well as the lower 02 sensor on the output side of the cat will the reading be messed up and then car react funny to that....???

[lilchild87]

Don't worry about the cat.. your resonator is the one who keeps the pressure.. if you get the right headers shouldn't be any problems

Whatever you do don't unplug the o2 sensors, that should keep as stock