This is the second version of my racetrack "UNSC Circuit" on rats nest. This track changes every lap (up until lap 4) to make the track a lot more difficult (and it makes it funner too). Here is a list of changes from v1 to v2:

Fixes:
-Added a gravity lift before the lap marker to slow you down to prevent you from crashing/flipping.
-Added a sloped bridge where mongooses start to reduce the amount of flipping by 90%! (I can't seem to get it perfect, but I flipped 1/12 times while testing it).
-Lowered the mongoose starting position by a lot! (To reduce flipping)
-Added a gravity lift right when you get inside red base on the staircase to help you turn.
-Removed the gravity lift in the 2nd indoor room and replaced it with barriers/teleporter arrows.
-Reinforced the gravity lift when you first go inside blue base with shield doors to make sure you don't fall off the track.
-Removed a hazard right when you get outside blue base (the barrels) because you almost always flip on that, but I left the next one because it's cool (in my opinion).

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For a brief map description, please click on the link that leads you to the map file. In there, you'll find a step-by-step guide on the entire track. Now, for the other stuff:

Feedback:
Please, if you are going to rate this leave a post below describing why you rated what you rated. If I can get a bunch of comments it will make future maps of mine bigger and better. Thank You!

Gametype location:
http://www.bungie.net/Forums/posts.aspx?postID=13422737

Join our RaceTracks Group:
http://www.bungie.net/fanclub/125611/Group/GroupHome.aspx

Complete List of all my Racetracks:
http://thaforumz.informe.com/viewtopic.php?p=23#23

This map is found in our Forge database:
http://www.bungie.net/fanclub/144854/Group/GroupHome.aspx
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Screenshots: from v1
Starting position

Going up center bridge

Going into red base

Second bridge

Leaving blue base

Lap marker

New challenge on lap 2

Another new challenge on lap 2

Last challenge on lap 2

Soccer balls on lap 3/4

More firepower for explosives on lap 4

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Map:
http://www.bungie.net/Forums/posts.aspx?postID=17053907