500 maximum engine revs

[AlfaSpider]

I’ve had my 500 for around a year and have always changed gear at 5000rpm maximum, i thought I’d read somewhere there’s a rev limiter at around 5500 rpm.
I’ve only just looked in the manual to see max power is at 5600rpm! With an engine with decent torque and a long stroke is there much more to be had by taking it to 5600?