Will about 220watts RMS be adiquate for a kicker 10" L7?

I currently have a Orion 600D that the CEA sticker says 635Watts RMS@ 1 Ohm and 435@ 2Ohm the amp is a Mono and i currently have it hooked up to a single kicker 10" L7 in a ported truck box @ 1 ohm! however i was wanting to buy anouther L7 same ohm and same box and wire it to acheive the 2 Ohm load from the amp which would give me around 217 watts i think and my ? is will this setup be louder than my single setup with just 1 sub at 600watts rather than 2 subs at 217 watts? and if so how much louder??