Vespa PK 50 (86) engine help


I need a little help here, i have a 86 vespa pk 50 ss (not elestart), the engine is a 75ccm but i want to get a little more juice from the motor. is there anything that i can add without the need of modding?like plug and play! hehe

Like an exhaust, cdi, air filter?

I'm from Portugal, and if i order wrong parts its annoying to exchange them and takes a lot of time!

Thanks in advance