Finding the Valve for the Nitro

[Todd]

I don't have the valve pipe. I think you said it is in level 27, my game system doesn't indicate the levels other than by name. Where more specifically is the valve pipe?

[tlr online]

LEVEL 27 - Trenches
Jump off of your bike at the top of the ramp and head to the right, climb up and over the step in front of the tree. Head forward through the streets until you come to a medium sized room containing a gun turret and several crates. Crouch and crawl around the back of the room until a crate blocks your progress. From here you can shoot the gas canister at the back of the gun to blow it up.
Now climb up onto the tallest box, then turn around and do a running jump and grab the edge of the opening high on the north wall. Pull yourself up, drop down through the hole in the floor and head through the corridor you land in. When you come to an opening at the base of the west wall, crawl through. As you crawl through, a guy with a machine gun will be shooting at you and two successive blasts of steam could bang up Lara real good. Avoid the steam while getting through as quickly as possible. You may need to burn some medi packs here. As soon as you are clear of the steam, shoot the bad guy. Then, exit the tunnel, turn to the north, and head into the next area. Face the west wall and climb up into the cove. Turn around and shoot the gas tank on the machine gun. You also might want to shoot the guy behind it. Then, drop down and crawl back through and out to the street.
Head north, then head east at the intersection. As this path turns to the left, you will find a crawl space on the right. Crawl into it to get the weapon key code. Grab it, then return to the street. Head straight and jump up and grab the ledge that you come to. Shimmy around to the right, avoiding the steam, and drop near the jeep that is on fire.
At the jeep's engine compartment, use the crowbar to pry loose the valve pipe. Go to your inventory to combine the valve pipe with the nitrous oxide canister to create the nitrous oxide feeder. Now, retrace your steps, find your bike, and install the nitrous oxide feeder, From this point forward, you will be able to get a heafty boost of speed for your motorbike by hitting the sprint button. Get on the bike and head back to the entrance to the chambers of tulun.