Screw that, It's just 4 8mm bolts / lay some rags down and pull the rail up - flip it right on top of the manifold. You can do it with it loose on the drivers side, but when you install new COP's , you have to make sure that the plug boots are centered on the plugs before you twist back and forth to get them seated on the right. That can be a b^tch with the rail in the way on most of them and it's so simple to relocate temporarily.
Also, it's easier to strip a coil bolt with the rail in the way. When there removed - It's allot easier sealing the plug/boot chambers off with di-electric grease or #8 - #10 O-Rings + Grease (however you do it).
But the answer to your question is - No, you don't have to remove it.
Last edited by jbrew; 06-26-2008 at 06:35 PM.