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Here is the manuals instructions, you will need to remove a portion of the exhaust.
REMOVAL & INSTALLATIONLocation of the rack and pinion steering gear mounting bolts
Use new gaskets and self-locking nuts when installing the catalytic converter.
WARNING Use only genuine Honda power steering fluid. Any other type or brand of fluid will damage the power steering pump.
Connect the steering joint and pinion shaft with the cable reel and steering rack centered. Verify that the lower joint bolt is securely seated in the pinion shaft groove. If the steering wheel and rack are not centered, reposition the serrations at the lower end of the steering joint.
Are you referring to the exhaust? If so it is the catalytic converter that needs to be removed. It resembles a muffler up towards the engine area. I don`t remember what the bolt size is. It will ultimately come out through the left side. There is a certain way of getting it out. Read the instructions closely.
In reference to your next reply that step is done after the rack is back in the car and the steering shaft is hooked up. Then the cover and lines.
You should not have to disassemble the new rack and if you do you may void any warranty on it. With the exhaust out of the way and the shift cable you should be able to install it through the left side. It will be tight and wiggling and twisting will need to be done. If you have some one to help guide the tie rod through the other side while you wiggle it in that may help.