I installed this manifold on my 90 Corolla with 4afe engine and the intermediate pipe that goes from the manifold to the catalytic converter is rubbing the subframe and the bottom of the car. The header fits well, but the intermediate pipe that comes with it is not the right size. I also had to carve out the connector for the O2 sensor because it wouldn't go in because there was weld slag in the hole. You paint it with high temperature paint, otherwise it won't stick, just a little tip. Well, in terms of power increase, I definitely felt a power increase, a little bit on the bottom and more in the middle and on top.
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