How can i de-restrict my DB50QT-25 viper scooter?

I broughte my scooter of Direct Bikes.co.uk
I thoughte to try the washer on the vareater but it was already gone.
I am now wondering what else to do.
Dont tell me buy a sports exhaust because i dont have the money.
Any other way to de-restrict this scooter would really really help thank you all.