20amp v 15amp

I'm the furthest thing from an engineer so layman's terms would be appreciated.  A friend of a friend has an Audioquest Niagara 5000 he's looking to move quickly.  The 5000 requires a 20amp power cord, which is fine; I'm happy picking one up.  My outlet is only rated for 15amps.  My question is, will I only really benefit if I replace the 15amp wall outlet with a 20amp wall outlet?