A few questions

[ST]

Figured i'd put all my latest q's in one thread to save space and time.
1. Which extractors are the better choice for my i6, pacemaker 4499's or 4490's (i've got a redback 2.5" catback exhaust)?
2. Will a hi-flow cat make any difference performance and sound wise?
3. I want a c2r front grille, now I can get one for the low profile or high profile bonnet. Does a Falcon (non-xr) look better with the high or low profile bonnet? Take into consideration this will be with a c2r grill too. I'm after a meaner/sportier look if that means anything. Pics would help.

That's about it for now :P. Thanks for any answers.