Originally Posted by MOS95B
When I did mine, I carefully took a hacksay to the back ("pointy") end, and then carefully pried them open with a wide flat tip screwdirver. Removes less plastic than a dremel (and I don't have a dremel, so...). A nice thin bead of 100% silcone gled 'em back together, and a bit thicker bead re-sealed the couple of inches of hacksaawing.
Oh but just like your welder this is an excuse to get one!!
Anyways zzzzzzeke was able to pretty much pop his open, heat will help, and if you get stuck use a dremel type tool. make sure they are VERY well sealed up though. And i don't have an air filter under the bumper, it'* in the same place yours is, my ram air just runs all the way up to it. Check out page 8 of Http://members.cardomain.com/bonnieboimn