Boss Splitter for the 10-12s looks sexy! Not that I am bias or anything...
I suggest taking the bumper off. Makes it a lot easier to work with. I took my bumper off, flipped it upside down, lined it up and tapped it in place with lots of painter's tape. Then did my drilling. Think it took me around 2hrs total with bumper removal and installation. If you do go that route, make sure you lay down something like a blanket so you don't scratch up your bumper.
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Airaid CAI | Borla S-Type Catback | Amsoil 10w30 and MTG Trans. Fluid
382hp 387ft/lb | 1/4: 12.9 @ 112mph