There is nothing to match between the amp and receiver. What needs to be matched is the speakers to the amplifier. You speakers will work fine with the Outlaw.
All things considered, you might not get more than 1-2 dB increase in overall SPL by adding the outboard amplifier. Lovingthehd is right, if you’re running your front speakers full range and don’t have a subwoofer, that’s probably why you’re running out of steam. If that’s the case, adding both the amp and a subwoofer would make a significant difference.
Regards,
Wayne A. Pflughaupt