In the setup I have, I'm pushing 2 12" Kicker CVRs with a 1000w Amp and a 1 farat Cap. The system sounds terrific, and there is no power dimming going on anywhere in the car. You'll be fine.
'05 Base Coupe, Blue, 2.2L, 5 speed manual, Too many mods to list in this signature. I'll just say insanely loud system, fully upgraded suspension (nothing original), Intake, Full Exhaust from the engine back, Rims, Tires, etc... Give me about a month to get back stateside and pics will be posted in the vBGarage.